diff --git a/CHANGES b/CHANGES
index 77e8b1bcb..4ebc4842f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -88,6 +88,7 @@ Bugs fixed
 * #3284: Sphinx crashes on parallel build with an extension which raises
   unserializable exception
 * #3315: Bibliography crashes on latex build with docclass 'memoir'
+* #3328: Could not refer rubric implicitly
 
 
 Release 1.5.1 (released Dec 13, 2016)
diff --git a/setup.cfg b/setup.cfg
index 73ac1e746..e341d921a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -25,5 +25,5 @@ universal = 1
 
 [flake8]
 max-line-length = 95
-ignore = E113,E116,E221,E226,E241,E251,E901
+ignore = E116,E241,E251
 exclude = .git,.tox,tests/*,build/*,sphinx/search/*,sphinx/pycode/pgen2/*,doc/ext/example*.py
diff --git a/sphinx/__init__.py b/sphinx/__init__.py
index ad9493ecd..0c931cd4d 100644
--- a/sphinx/__init__.py
+++ b/sphinx/__init__.py
@@ -30,7 +30,7 @@ if 'PYTHONWARNINGS' not in os.environ:
 warnings.filterwarnings('ignore', "'U' mode is deprecated",
                         DeprecationWarning, module='docutils.io')
 
-__version__  = '1.6'
+__version__ = '1.6'
 __released__ = '1.6+'  # used when Sphinx builds its own docs
 
 # version info for better programmatic use
diff --git a/sphinx/apidoc.py b/sphinx/apidoc.py
index e48a527a5..0fca17d81 100644
--- a/sphinx/apidoc.py
+++ b/sphinx/apidoc.py
@@ -384,8 +384,8 @@ Note: By default this script will not overwrite already created files.""")
             text += '   %s\n' % module
         d = dict(
             path = opts.destdir,
-            sep  = False,
-            dot  = '_',
+            sep = False,
+            dot = '_',
             project = opts.header,
             author = opts.author or 'Author',
             version = opts.version or '',
diff --git a/sphinx/application.py b/sphinx/application.py
index c5634b4ca..6ea7b059f 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -632,9 +632,9 @@ class Sphinx(object):
             else:
                 # ignore invalid keys for compatibility
                 continue
-            setattr(translator, 'visit_'+node.__name__, visit)
+            setattr(translator, 'visit_' + node.__name__, visit)
             if depart:
-                setattr(translator, 'depart_'+node.__name__, depart)
+                setattr(translator, 'depart_' + node.__name__, depart)
 
     def add_enumerable_node(self, node, figtype, title_getter=None, **kwds):
         # type: (nodes.Node, unicode, Callable, Any) -> None
diff --git a/sphinx/builders/changes.py b/sphinx/builders/changes.py
index d6e118d97..fc8532794 100644
--- a/sphinx/builders/changes.py
+++ b/sphinx/builders/changes.py
@@ -141,7 +141,7 @@ class ChangesBuilder(Builder):
             targetfn = path.join(self.outdir, 'rst', os_path(docname)) + '.html'
             ensuredir(path.dirname(targetfn))
             with codecs.open(targetfn, 'w', 'utf-8') as f:  # type: ignore
-                text = ''.join(hl(i+1, line) for (i, line) in enumerate(lines))
+                text = ''.join(hl(i + 1, line) for (i, line) in enumerate(lines))
                 ctx = {
                     'filename': self.env.doc2path(docname, None),
                     'text': text
diff --git a/sphinx/builders/html.py b/sphinx/builders/html.py
index 04d63a046..f7fe53cac 100644
--- a/sphinx/builders/html.py
+++ b/sphinx/builders/html.py
@@ -522,7 +522,7 @@ class StandaloneHTMLBuilder(Builder):
 
         # additional pages from conf.py
         for pagename, template in self.config.html_additional_pages.items():
-            logger.info(' '+pagename, nonl=1)
+            self.info(' ' + pagename, nonl=1)
             self.handle_page(pagename, {}, template)
 
         # the search page
@@ -1003,7 +1003,7 @@ class SingleFileHTMLBuilder(StandaloneHTMLBuilder):
             hashindex = refuri.find('#')
             if hashindex < 0:
                 continue
-            hashindex = refuri.find('#', hashindex+1)
+            hashindex = refuri.find('#', hashindex + 1)
             if hashindex >= 0:
                 refnode['refuri'] = fname + refuri[hashindex:]
 
@@ -1116,7 +1116,7 @@ class SingleFileHTMLBuilder(StandaloneHTMLBuilder):
 
         # additional pages from conf.py
         for pagename, template in self.config.html_additional_pages.items():
-            logger.info(' '+pagename, nonl=1)
+            self.info(' ' + pagename, nonl=1)
             self.handle_page(pagename, {}, template)
 
         if self.config.html_use_opensearch:
diff --git a/sphinx/builders/htmlhelp.py b/sphinx/builders/htmlhelp.py
index 852700123..08e6f9df4 100644
--- a/sphinx/builders/htmlhelp.py
+++ b/sphinx/builders/htmlhelp.py
@@ -215,12 +215,12 @@ class HTMLHelpBuilder(StandaloneHTMLBuilder):
 
     def build_hhx(self, outdir, outname):
         logger.info('dumping stopword list...')
-        with self.open_file(outdir, outname+'.stp') as f:
+        with self.open_file(outdir, outname + '.stp') as f:
             for word in sorted(stopwords):
                 print(word, file=f)
 
         logger.info('writing project file...')
-        with self.open_file(outdir, outname+'.hhp') as f:
+        with self.open_file(outdir, outname + '.hhp') as f:
             f.write(project_template % {
                 'outname': outname,
                 'title': self.config.html_title,
@@ -241,7 +241,7 @@ class HTMLHelpBuilder(StandaloneHTMLBuilder):
                               file=f)
 
         logger.info('writing TOC file...')
-        with self.open_file(outdir, outname+'.hhc') as f:
+        with self.open_file(outdir, outname + '.hhc') as f:
             f.write(contents_header)
             # special books
             f.write('<LI> ' + object_sitemap % (self.config.html_short_title,
@@ -266,7 +266,7 @@ class HTMLHelpBuilder(StandaloneHTMLBuilder):
                     if ullevel != 0:
                         f.write('<UL>\n')
                     for subnode in node:
-                        write_toc(subnode, ullevel+1)
+                        write_toc(subnode, ullevel + 1)
                     if ullevel != 0:
                         f.write('</UL>\n')
                 elif isinstance(node, addnodes.compact_paragraph):
@@ -282,7 +282,7 @@ class HTMLHelpBuilder(StandaloneHTMLBuilder):
 
         logger.info('writing index file...')
         index = self.env.create_index(self)
-        with self.open_file(outdir, outname+'.hhk') as f:
+        with self.open_file(outdir, outname + '.hhk') as f:
             f.write('<UL>\n')
 
             def write_index(title, refs, subitems):
diff --git a/sphinx/builders/linkcheck.py b/sphinx/builders/linkcheck.py
index d9e5d5696..7b536e9e5 100644
--- a/sphinx/builders/linkcheck.py
+++ b/sphinx/builders/linkcheck.py
@@ -243,7 +243,7 @@ class CheckExternalLinksBuilder(Builder):
             logger.info(darkgray('-local-   ') + uri)
             self.write_entry('local', docname, lineno, uri)
         elif status == 'working':
-            logger.info(darkgreen('ok        ')  + uri + info)
+            logger.info(darkgreen('ok        ') + uri + info)
         elif status == 'broken':
             self.write_entry('broken', docname, lineno, uri + ': ' + info)
             if self.app.quiet or self.app.warningiserror:
@@ -261,7 +261,7 @@ class CheckExternalLinksBuilder(Builder):
             }[code]
             self.write_entry('redirected ' + text, docname, lineno,
                              uri + ' to ' + info)
-            logger.info(color('redirect  ') + uri + color(' - ' + text + ' to '  + info))
+            logger.info(color('redirect  ') + uri + color(' - ' + text + ' to ' + info))
 
     def get_target_uri(self, docname, typ=None):
         # type: (unicode, unicode) -> unicode
diff --git a/sphinx/builders/qthelp.py b/sphinx/builders/qthelp.py
index 6ed9c6b7e..4223e2ec9 100644
--- a/sphinx/builders/qthelp.py
+++ b/sphinx/builders/qthelp.py
@@ -98,7 +98,7 @@ project_template = u'''\
 '''
 
 section_template = '<section title="%(title)s" ref="%(ref)s"/>'
-file_template = ' '*12 + '<file>%(filename)s</file>'
+file_template = ' ' * 12 + '<file>%(filename)s</file>'
 
 
 class QtHelpBuilder(StandaloneHTMLBuilder):
@@ -203,7 +203,7 @@ class QtHelpBuilder(StandaloneHTMLBuilder):
         nspace = nspace.lower()
 
         # write the project file
-        with codecs.open(path.join(outdir, outname+'.qhp'), 'w', 'utf-8') as f:  # type: ignore
+        with codecs.open(path.join(outdir, outname + '.qhp'), 'w', 'utf-8') as f:  # type: ignore
             f.write(project_template % {  # type: ignore
                 'outname': htmlescape(outname),
                 'title': htmlescape(self.config.html_title),
@@ -220,7 +220,7 @@ class QtHelpBuilder(StandaloneHTMLBuilder):
         startpage = 'qthelp://' + posixpath.join(nspace, 'doc', 'index.html')
 
         logger.info('writing collection project file...')
-        with codecs.open(path.join(outdir, outname+'.qhcp'), 'w', 'utf-8') as f:  # type: ignore  # NOQA
+        with codecs.open(path.join(outdir, outname + '.qhcp'), 'w', 'utf-8') as f:  # type: ignore  # NOQA
             f.write(collection_template % {  # type: ignore
                 'outname': htmlescape(outname),
                 'title': htmlescape(self.config.html_short_title),
@@ -251,10 +251,10 @@ class QtHelpBuilder(StandaloneHTMLBuilder):
             title = htmlescape(refnode.astext()).replace('"', '&quot;')
             item = '<section title="%(title)s" ref="%(ref)s">' % \
                 {'title': title, 'ref': link}
-            parts.append(' '*4*indentlevel + item)
+            parts.append(' ' * 4 * indentlevel + item)
             for subnode in node.children[1]:
-                parts.extend(self.write_toc(subnode, indentlevel+1))
-            parts.append(' '*4*indentlevel + '</section>')
+                parts.extend(self.write_toc(subnode, indentlevel + 1))
+            parts.append(' ' * 4 * indentlevel + '</section>')
         elif isinstance(node, nodes.list_item):
             for subnode in node:
                 parts.extend(self.write_toc(subnode, indentlevel))
@@ -288,10 +288,10 @@ class QtHelpBuilder(StandaloneHTMLBuilder):
             id = None
 
         if id:
-            item = ' '*12 + '<keyword name="%s" id="%s" ref="%s"/>' % (
+            item = ' ' * 12 + '<keyword name="%s" id="%s" ref="%s"/>' % (
                 name, id, ref[1])
         else:
-            item = ' '*12 + '<keyword name="%s" ref="%s"/>' % (name, ref[1])
+            item = ' ' * 12 + '<keyword name="%s" ref="%s"/>' % (name, ref[1])
         item.encode('ascii', 'xmlcharrefreplace')
         return item
 
diff --git a/sphinx/builders/texinfo.py b/sphinx/builders/texinfo.py
index 804fd9587..b8a3a38d7 100644
--- a/sphinx/builders/texinfo.py
+++ b/sphinx/builders/texinfo.py
@@ -136,7 +136,7 @@ class TexinfoBuilder(Builder):
                                'document %s', docname)
                 continue
             self.document_data.append(entry)  # type: ignore
-            if docname.endswith(SEP+'index'):
+            if docname.endswith(SEP + 'index'):
                 docname = docname[:-5]
             self.titles.append((docname, entry[2]))
 
@@ -227,7 +227,7 @@ class TexinfoBuilder(Builder):
         if self.images:
             logger.info(bold('copying images...'), nonl=1)
             for src, dest in iteritems(self.images):
-                logger.info(' '+src, nonl=1)
+                logger.info(' ' + src, nonl=1)
                 copyfile(path.join(self.srcdir, src),
                          path.join(self.outdir, dest))
             logger.info('')
diff --git a/sphinx/builders/websupport.py b/sphinx/builders/websupport.py
index 1154b3419..2ed37a697 100644
--- a/sphinx/builders/websupport.py
+++ b/sphinx/builders/websupport.py
@@ -141,7 +141,7 @@ class WebSupportBuilder(PickleHTMLBuilder):
         # "show source" link
         if ctx.get('sourcename'):
             source_name = path.join(self.staticdir,
-                                    '_sources',  os_path(ctx['sourcename']))
+                                    '_sources', os_path(ctx['sourcename']))
             ensuredir(path.dirname(source_name))
             copyfile(self.env.doc2path(pagename), source_name)
 
diff --git a/sphinx/directives/code.py b/sphinx/directives/code.py
index 03936f4e8..e7fdd1274 100644
--- a/sphinx/directives/code.py
+++ b/sphinx/directives/code.py
@@ -116,7 +116,7 @@ class CodeBlock(Directive):
         if linespec:
             try:
                 nlines = len(self.content)
-                hl_lines = [x+1 for x in parselinenos(linespec, nlines)]
+                hl_lines = [x + 1 for x in parselinenos(linespec, nlines)]
             except ValueError as err:
                 document = self.state.document
                 return [document.reporter.warning(str(err), line=self.lineno)]
@@ -277,7 +277,7 @@ class LiteralInclude(Directive):
                     'Object named %r not found in include file %r' %
                     (objectname, filename), line=self.lineno)]
             else:
-                lines = lines[tags[objectname][1]-1: tags[objectname][2]-1]
+                lines = lines[tags[objectname][1] - 1: tags[objectname][2] - 1]
                 if 'lineno-match' in self.options:
                     linenostart = tags[objectname][1]
 
@@ -309,7 +309,7 @@ class LiteralInclude(Directive):
         linespec = self.options.get('emphasize-lines')
         if linespec:
             try:
-                hl_lines = [x+1 for x in parselinenos(linespec, len(lines))]
+                hl_lines = [x + 1 for x in parselinenos(linespec, len(lines))]
             except ValueError as err:
                 return [document.reporter.warning(str(err), line=self.lineno)]
         else:
diff --git a/sphinx/directives/other.py b/sphinx/directives/other.py
index 06a3f745d..801fd8cad 100644
--- a/sphinx/directives/other.py
+++ b/sphinx/directives/other.py
@@ -215,7 +215,7 @@ class VersionChange(Directive):
         text = versionlabels[self.name] % self.arguments[0]
         if len(self.arguments) == 2:
             inodes, messages = self.state.inline_text(self.arguments[1],
-                                                      self.lineno+1)
+                                                      self.lineno + 1)
             para = nodes.paragraph(self.arguments[1], '', *inodes, translatable=False)
             set_source_info(self, para)
             node.append(para)
@@ -340,7 +340,7 @@ class HList(Directive):
         index = 0
         newnode = addnodes.hlist()
         for column in range(ncolumns):
-            endindex = index + (column < nmore and (npercol+1) or npercol)
+            endindex = index + (column < nmore and (npercol + 1) or npercol)
             col = addnodes.hlistcol()
             col += nodes.bullet_list()
             col[0] += fulllist.children[index:endindex]
diff --git a/sphinx/domains/c.py b/sphinx/domains/c.py
index 22b221318..8afff5716 100644
--- a/sphinx/domains/c.py
+++ b/sphinx/domains/c.py
@@ -85,7 +85,7 @@ class CObject(ObjectDescription):
         # add cross-ref nodes for all words
         for part in [_f for _f in wsplit_re.split(ctype) if _f]:  # type: ignore
             tnode = nodes.Text(part, part)
-            if part[0] in string.ascii_letters+'_' and \
+            if part[0] in string.ascii_letters + '_' and \
                part not in self.stopwords:
                 pnode = addnodes.pending_xref(
                     '', refdomain='c', reftype='type', reftarget=part,
@@ -172,7 +172,7 @@ class CObject(ObjectDescription):
                     ctype, argname = arg.rsplit(' ', 1)
                     self._parse_type(param, ctype)
                     # separate by non-breaking space in the output
-                    param += nodes.emphasis(' '+argname, u'\xa0'+argname)
+                    param += nodes.emphasis(' ' + argname, u'\xa0' + argname)
             except ValueError:
                 # no argument name given, only the type
                 self._parse_type(param, arg)
@@ -245,7 +245,7 @@ class CXRefRole(XRefRole):
                 title = title[1:]
                 dot = title.rfind('.')
                 if dot != -1:
-                    title = title[dot+1:]
+                    title = title[dot + 1:]
         return title, target
 
 
diff --git a/sphinx/domains/cpp.py b/sphinx/domains/cpp.py
index cfdbc99d9..181ed3f78 100644
--- a/sphinx/domains/cpp.py
+++ b/sphinx/domains/cpp.py
@@ -3198,14 +3198,14 @@ class Symbol(object):
 
     def to_string(self, indent):
         # type: (int) -> unicode
-        res = ['\t'*indent]  # type: List[unicode]
+        res = ['\t' * indent]  # type: List[unicode]
         if not self.parent:
             res.append('::')
         else:
             if self.templateParams:
                 res.append(text_type(self.templateParams))
                 res.append('\n')
-                res.append('\t'*indent)
+                res.append('\t' * indent)
             if self.identifier:
                 res.append(text_type(self.identifier))
             else:
diff --git a/sphinx/domains/javascript.py b/sphinx/domains/javascript.py
index 6d7920411..4cd0eda6e 100644
--- a/sphinx/domains/javascript.py
+++ b/sphinx/domains/javascript.py
@@ -160,7 +160,7 @@ class JSXRefRole(XRefRole):
                 title = title[1:]
                 dot = title.rfind('.')
                 if dot != -1:
-                    title = title[dot+1:]
+                    title = title[dot + 1:]
         if target[0:1] == '.':
             target = target[1:]
             refnode['refspecific'] = True
diff --git a/sphinx/domains/python.py b/sphinx/domains/python.py
index 2efc6db0b..688062be6 100644
--- a/sphinx/domains/python.py
+++ b/sphinx/domains/python.py
@@ -563,7 +563,7 @@ class PyXRefRole(XRefRole):
                 title = title[1:]
                 dot = title.rfind('.')
                 if dot != -1:
-                    title = title[dot+1:]
+                    title = title[dot + 1:]
         # if the first character is a dot, search more specific namespaces first
         # else search builtins first
         if target[0:1] == '.':
diff --git a/sphinx/domains/std.py b/sphinx/domains/std.py
index 9869f71aa..eeca858ca 100644
--- a/sphinx/domains/std.py
+++ b/sphinx/domains/std.py
@@ -77,7 +77,7 @@ class GenericObject(ObjectDescription):
             colon = self.indextemplate.find(':')
             if colon != -1:
                 indextype = self.indextemplate[:colon].strip()
-                indexentry = self.indextemplate[colon+1:].strip() % (name,)
+                indexentry = self.indextemplate[colon + 1:].strip() % (name,)
             else:
                 indextype = 'single'
                 indexentry = self.indextemplate % (name,)
@@ -139,7 +139,7 @@ class Target(Directive):
             colon = indexentry.find(':')
             if colon != -1:
                 indextype = indexentry[:colon].strip()
-                indexentry = indexentry[colon+1:].strip()
+                indexentry = indexentry[colon + 1:].strip()
             inode = addnodes.index(entries=[(indextype, indexentry,
                                              targetname, '', None)])
             ret.insert(0, inode)
@@ -600,7 +600,7 @@ class StandardDomain(Domain):
                                'in ' + env.doc2path(labels[name][0]),
                                location=node)
             anonlabels[name] = docname, labelid
-            if node.tagname == 'section':
+            if node.tagname in ('section', 'rubric'):
                 sectname = clean_astext(node[0])  # node[0] == title node
             elif self.is_enumerable_node(node):
                 sectname = self.get_numfig_title(node)
diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index dee67c96d..8de0a9960 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -692,7 +692,7 @@ class BuildEnvironment(object):
             lineend = len(error.object)
         lineno = error.object.count(b'\n', 0, error.start) + 1
         logger.warning('undecodable source characters, replacing with "?": %r',
-                       (error.object[linestart+1:error.start] + b'>>>' +
+                       (error.object[linestart + 1:error.start] + b'>>>' +
                         error.object[error.start:error.end] + b'<<<' +
                         error.object[error.end:lineend]),
                        location=(self.docname, lineno))
diff --git a/sphinx/environment/managers/toctree.py b/sphinx/environment/managers/toctree.py
index 8f247c986..c272e891d 100644
--- a/sphinx/environment/managers/toctree.py
+++ b/sphinx/environment/managers/toctree.py
@@ -241,11 +241,11 @@ class Toctree(EnvironmentManager):
                 if isinstance(subnode, (addnodes.compact_paragraph,
                                         nodes.list_item)):
                     # for <p> and <li>, indicate the depth level and recurse
-                    subnode['classes'].append('toctree-l%d' % (depth-1))
+                    subnode['classes'].append('toctree-l%d' % (depth - 1))
                     _toctree_add_classes(subnode, depth)
                 elif isinstance(subnode, nodes.bullet_list):
                     # for <ul>, just recurse
-                    _toctree_add_classes(subnode, depth+1)
+                    _toctree_add_classes(subnode, depth + 1)
                 elif isinstance(subnode, nodes.reference):
                     # for <a>, identify which entries point to the current
                     # document and therefore may not be collapsed
@@ -435,7 +435,7 @@ class Toctree(EnvironmentManager):
                         subnode.parent.remove(subnode)
                     else:
                         # recurse on visible children
-                        self._toctree_prune(subnode, depth+1, maxdepth,  collapse)
+                        self._toctree_prune(subnode, depth + 1, maxdepth, collapse)
 
     def assign_section_numbers(self):
         # type: () -> List[unicode]
@@ -453,7 +453,7 @@ class Toctree(EnvironmentManager):
             for subnode in node.children:
                 if isinstance(subnode, nodes.bullet_list):
                     numstack.append(0)
-                    _walk_toc(subnode, secnums, depth-1, titlenode)
+                    _walk_toc(subnode, secnums, depth - 1, titlenode)
                     numstack.pop()
                     titlenode = None
                 elif isinstance(subnode, nodes.list_item):
diff --git a/sphinx/ext/autosummary/__init__.py b/sphinx/ext/autosummary/__init__.py
index 89fdbe522..4f3ce4c65 100644
--- a/sphinx/ext/autosummary/__init__.py
+++ b/sphinx/ext/autosummary/__init__.py
@@ -111,7 +111,7 @@ def process_autosummary_toc(app, doctree):
             if not isinstance(subnode, nodes.section):
                 continue
             if subnode not in crawled:
-                crawl_toc(subnode, depth+1)
+                crawl_toc(subnode, depth + 1)
     crawl_toc(doctree)
 
 
@@ -284,7 +284,7 @@ class Autosummary(Directive):
             if not isinstance(obj, ModuleType):
                 # give explicitly separated module name, so that members
                 # of inner classes can be documented
-                full_name = modname + '::' + full_name[len(modname)+1:]
+                full_name = modname + '::' + full_name[len(modname) + 1:]
             # NB. using full_name here is important, since Documenters
             #     handle module prefixes slightly differently
             documenter = get_documenter(obj, parent)(self, full_name)
@@ -423,13 +423,13 @@ def mangle_signature(sig, max_chars=30):
         s = m.group(1)[:-2]
 
     # Produce a more compact signature
-    sig = limited_join(", ", args, max_chars=max_chars-2)
+    sig = limited_join(", ", args, max_chars=max_chars - 2)
     if opts:
         if not sig:
-            sig = "[%s]" % limited_join(", ", opts, max_chars=max_chars-4)
+            sig = "[%s]" % limited_join(", ", opts, max_chars=max_chars - 4)
         elif len(sig) < max_chars - 4 - 2 - 3:
             sig += "[, %s]" % limited_join(", ", opts,
-                                           max_chars=max_chars-len(sig)-4-2)
+                                           max_chars=max_chars - len(sig) - 4 - 2)
 
     return u"(%s)" % sig
 
@@ -521,7 +521,7 @@ def _import_by_name(name):
         # ... then as MODNAME, MODNAME.OBJ1, MODNAME.OBJ1.OBJ2, ...
         last_j = 0
         modname = None
-        for j in reversed(range(1, len(name_parts)+1)):
+        for j in reversed(range(1, len(name_parts) + 1)):
             last_j = j
             modname = '.'.join(name_parts[:j])
             try:
diff --git a/sphinx/ext/doctest.py b/sphinx/ext/doctest.py
index dafe2863e..c355415f7 100644
--- a/sphinx/ext/doctest.py
+++ b/sphinx/ext/doctest.py
@@ -260,7 +260,7 @@ class DocTestBuilder(Builder):
         self.outfile.write('''\
 Results of doctest builder run on %s
 ==================================%s
-''' % (date, '='*len(date)))
+''' % (date, '=' * len(date)))
 
     def _out(self, text):
         # type: (unicode) -> None
@@ -377,7 +377,7 @@ Doctest summary
             return
 
         self._out('\nDocument: %s\n----------%s\n' %
-                  (docname, '-'*len(docname)))
+                  (docname, '-' * len(docname)))
         for group in itervalues(groups):
             self.test_group(group, self.env.doc2path(docname, base=None))
         # Separately count results from setup code
diff --git a/sphinx/ext/imgmath.py b/sphinx/ext/imgmath.py
index e559530c3..168862d28 100644
--- a/sphinx/ext/imgmath.py
+++ b/sphinx/ext/imgmath.py
@@ -231,7 +231,7 @@ def get_tooltip(self, node):
 def html_visit_math(self, node):
     # type: (nodes.NodeVisitor, math_node) -> None
     try:
-        fname, depth = render_math(self, '$'+node['latex']+'$')
+        fname, depth = render_math(self, '$' + node['latex'] + '$')
     except MathExtError as exc:
         msg = text_type(exc)
         sm = nodes.system_message(msg, type='WARNING', level=2,
diff --git a/sphinx/ext/intersphinx.py b/sphinx/ext/intersphinx.py
index af39722ce..fac640e00 100644
--- a/sphinx/ext/intersphinx.py
+++ b/sphinx/ext/intersphinx.py
@@ -83,7 +83,7 @@ def read_inventory_v1(f, uri, join):
     return invdata
 
 
-def read_inventory_v2(f, uri, join, bufsize=16*1024):
+def read_inventory_v2(f, uri, join, bufsize=16 * 1024):
     # type: (IO, unicode, Callable, int) -> Inventory
     invdata = {}  # type: Inventory
     line = f.readline()
@@ -109,7 +109,7 @@ def read_inventory_v2(f, uri, join, bufsize=16*1024):
             lineend = buf.find(b'\n')
             while lineend != -1:
                 yield buf[:lineend].decode('utf-8')
-                buf = buf[lineend+1:]
+                buf = buf[lineend + 1:]
                 lineend = buf.find(b'\n')
         assert not buf
 
@@ -134,7 +134,7 @@ def read_inventory_v2(f, uri, join, bufsize=16*1024):
     return invdata
 
 
-def read_inventory(f, uri, join, bufsize=16*1024):
+def read_inventory(f, uri, join, bufsize=16 * 1024):
     # type: (IO, unicode, Callable, int) -> Inventory
     line = f.readline().rstrip().decode('utf-8')
     if line == '# Sphinx inventory version 1':
@@ -371,9 +371,9 @@ def missing_reference(app, env, node, contnode):
                     (domain == 'std' and node['reftype'] == 'keyword'):
                 # use whatever title was given, but strip prefix
                 title = contnode.astext()
-                if in_set and title.startswith(in_set+':'):
-                    newnode.append(contnode.__class__(title[len(in_set)+1:],
-                                                      title[len(in_set)+1:]))
+                if in_set and title.startswith(in_set + ':'):
+                    newnode.append(contnode.__class__(title[len(in_set) + 1:],
+                                                      title[len(in_set) + 1:]))
                 else:
                     newnode.append(contnode)
             else:
diff --git a/sphinx/ext/pngmath.py b/sphinx/ext/pngmath.py
index f4431b07f..0bc941ee2 100644
--- a/sphinx/ext/pngmath.py
+++ b/sphinx/ext/pngmath.py
@@ -203,7 +203,7 @@ def get_tooltip(self, node):
 def html_visit_math(self, node):
     # type: (nodes.NodeVisitor, math_node) -> None
     try:
-        fname, depth = render_math(self, '$'+node['latex']+'$')
+        fname, depth = render_math(self, '$' + node['latex'] + '$')
     except MathExtError as exc:
         msg = text_type(exc)
         sm = nodes.system_message(msg, type='WARNING', level=2,
diff --git a/sphinx/ext/todo.py b/sphinx/ext/todo.py
index f575e7462..430135721 100644
--- a/sphinx/ext/todo.py
+++ b/sphinx/ext/todo.py
@@ -152,7 +152,7 @@ def process_todo_nodes(app, doctree, fromdocname):
                     (todo_info['source'], todo_info['lineno'])
                 )
             desc1 = description[:description.find('<<')]
-            desc2 = description[description.find('>>')+2:]
+            desc2 = description[description.find('>>') + 2:]
             para += nodes.Text(desc1, desc1)
 
             # Create a reference
diff --git a/sphinx/make_mode.py b/sphinx/make_mode.py
index 2da5d5b71..346f9db2d 100644
--- a/sphinx/make_mode.py
+++ b/sphinx/make_mode.py
@@ -83,7 +83,7 @@ class Make(object):
     def build_help(self):
         # type: () -> None
         print(bold("Sphinx v%s" % sphinx.__display_version__))
-        print("Please use `make %s' where %s is one of" % ((blue('target'),)*2))  # type: ignore  # NOQA
+        print("Please use `make %s' where %s is one of" % ((blue('target'),) * 2))  # type: ignore  # NOQA
         for osname, bname, description in BUILDERS:
             if not osname or os.name == osname:
                 print('  %s  %s' % (blue(bname.ljust(10)), description))
diff --git a/sphinx/pycode/__init__.py b/sphinx/pycode/__init__.py
index 2c898560b..bf8848305 100644
--- a/sphinx/pycode/__init__.py
+++ b/sphinx/pycode/__init__.py
@@ -368,4 +368,4 @@ if __name__ == '__main__':
     pprint.pprint(ma.find_tags())
     x3 = time.time()
     # print nodes.nice_repr(ma.parsetree, number2name)
-    print("tokenizing %.4f, parsing %.4f, finding %.4f" % (x1-x0, x2-x1, x3-x2))
+    print("tokenizing %.4f, parsing %.4f, finding %.4f" % (x1 - x0, x2 - x1, x3 - x2))
diff --git a/sphinx/pycode/nodes.py b/sphinx/pycode/nodes.py
index b6b3355c0..099fc2cf2 100644
--- a/sphinx/pycode/nodes.py
+++ b/sphinx/pycode/nodes.py
@@ -39,7 +39,7 @@ class BaseNode(object):
             if child is self:
                 if i == 0:
                     return None
-                return self.parent.children[i-1]
+                return self.parent.children[i - 1]
 
     def get_next_sibling(self):
         """Return next child in parent's children, or None."""
@@ -48,7 +48,7 @@ class BaseNode(object):
         for i, child in enumerate(self.parent.children):
             if child is self:
                 try:
-                    return self.parent.children[i+1]
+                    return self.parent.children[i + 1]
                 except IndexError:
                     return None
 
diff --git a/sphinx/quickstart.py b/sphinx/quickstart.py
index eb5349ede..66a3b057a 100644
--- a/sphinx/quickstart.py
+++ b/sphinx/quickstart.py
@@ -302,11 +302,11 @@ document is a custom template, you can also set this to another filename.''')
         do_prompt(d, 'master', 'Name of your master document (without suffix)',
                   'index')
 
-    while path.isfile(path.join(d['path'], d['master']+d['suffix'])) or \
-            path.isfile(path.join(d['path'], 'source', d['master']+d['suffix'])):
+    while path.isfile(path.join(d['path'], d['master'] + d['suffix'])) or \
+            path.isfile(path.join(d['path'], 'source', d['master'] + d['suffix'])):
         print()
         print(bold('Error: the master file %s has already been found in the '
-                   'selected root path.' % (d['master']+d['suffix'])))
+                   'selected root path.' % (d['master'] + d['suffix'])))
         print('sphinx-quickstart will not overwrite the existing file.')
         print()
         do_prompt(d, 'master', 'Please enter a new file name, or rename the '
@@ -633,7 +633,7 @@ def main(argv=sys.argv):
             d.setdefault('version', '')
             d.setdefault('release', d['version'])
             d2 = DEFAULT_VALUE.copy()
-            d2.update(dict(("ext_"+ext, False) for ext in EXTENSIONS))
+            d2.update(dict(("ext_" + ext, False) for ext in EXTENSIONS))
             d2.update(d)
             d = d2
             if 'no_makefile' in d:
diff --git a/sphinx/roles.py b/sphinx/roles.py
index 182a3db21..6723b0122 100644
--- a/sphinx/roles.py
+++ b/sphinx/roles.py
@@ -201,7 +201,7 @@ def indexmarkup_role(typ, rawtext, text, lineno, inliner,
             return [prb], [msg]
         ref = inliner.document.settings.pep_base_url + 'pep-%04d' % pepnum
         sn = nodes.strong(title, title)
-        rn = nodes.reference('', '', internal=False, refuri=ref+anchor,
+        rn = nodes.reference('', '', internal=False, refuri=ref + anchor,
                              classes=[typ])
         rn += sn
         return [indexnode, targetnode, rn], []
@@ -223,7 +223,7 @@ def indexmarkup_role(typ, rawtext, text, lineno, inliner,
             return [prb], [msg]
         ref = inliner.document.settings.rfc_base_url + inliner.rfc_url % rfcnum
         sn = nodes.strong(title, title)
-        rn = nodes.reference('', '', internal=False, refuri=ref+anchor,
+        rn = nodes.reference('', '', internal=False, refuri=ref + anchor,
                              classes=[typ])
         rn += sn
         return [indexnode, targetnode, rn], []
diff --git a/sphinx/transforms/i18n.py b/sphinx/transforms/i18n.py
index 8663c573d..04bc4f8ee 100644
--- a/sphinx/transforms/i18n.py
+++ b/sphinx/transforms/i18n.py
@@ -123,7 +123,7 @@ class Locale(Transform):
             # literalblock need literal block notation to avoid it become
             # paragraph.
             if isinstance(node, LITERAL_TYPE_NODES):
-                msgstr = '::\n\n' + indent(msgstr, ' '*3)
+                msgstr = '::\n\n' + indent(msgstr, ' ' * 3)
 
             patch = publish_msgstr(
                 env.app, msgstr, source, node.line, env.config, settings)
@@ -249,7 +249,7 @@ class Locale(Transform):
             # literalblock need literal block notation to avoid it become
             # paragraph.
             if isinstance(node, LITERAL_TYPE_NODES):
-                msgstr = '::\n\n' + indent(msgstr, ' '*3)
+                msgstr = '::\n\n' + indent(msgstr, ' ' * 3)
 
             patch = publish_msgstr(
                 env.app, msgstr, source, node.line, env.config, settings)
diff --git a/sphinx/util/__init__.py b/sphinx/util/__init__.py
index ff5e35fa4..f2cb2f24b 100644
--- a/sphinx/util/__init__.py
+++ b/sphinx/util/__init__.py
@@ -110,7 +110,7 @@ def get_matching_docs(dirname, suffixes, exclude_matchers=()):
     for filename in get_matching_files(dirname, exclude_matchers):
         for suffixpattern in suffixpatterns:
             if fnmatch.fnmatch(filename, suffixpattern):  # type: ignore
-                yield filename[:-len(suffixpattern)+1]
+                yield filename[:-len(suffixpattern) + 1]
                 break
 
 
@@ -183,7 +183,7 @@ def copy_static_entry(source, targetdir, builder, context={},
             if path.isdir(path.join(source, entry)):
                 newtarget = path.join(targetdir, entry)
             copy_static_entry(path.join(source, entry), newtarget,
-                              builder, context, level=level+1,
+                              builder, context, level=level + 1,
                               exclude_matchers=exclude_matchers)
 
 
@@ -380,9 +380,9 @@ def parselinenos(spec, total):
             if len(begend) > 2:
                 raise ValueError
             if len(begend) == 1:
-                items.append(int(begend[0])-1)
+                items.append(int(begend[0]) - 1)
             else:
-                start = (begend[0] == '') and 0 or int(begend[0])-1
+                start = (begend[0] == '') and 0 or int(begend[0]) - 1
                 end = (begend[1] == '') and total or int(begend[1])
                 items.extend(range(start, end))
         except Exception:
@@ -420,13 +420,13 @@ def rpartition(s, t):
     """Similar to str.rpartition from 2.5, but doesn't return the separator."""
     i = s.rfind(t)
     if i != -1:
-        return s[:i], s[i+len(t):]
+        return s[:i], s[i + len(t):]
     return '', s
 
 
 def split_into(n, type, value):
     """Split an index entry into a given number of parts at semicolons."""
-    parts = [x.strip() for x in value.split(';', n-1)]
+    parts = [x.strip() for x in value.split(';', n - 1)]
     if sum(1 for part in parts if part) < n:
         raise ValueError('invalid %s index entry %r' % (type, value))
     return parts
diff --git a/sphinx/util/console.py b/sphinx/util/console.py
index f4e03775f..b418edfb8 100644
--- a/sphinx/util/console.py
+++ b/sphinx/util/console.py
@@ -123,8 +123,8 @@ _colors = [
 ]
 
 for i, (dark, light) in enumerate(_colors):
-    codes[dark] = '\x1b[%im' % (i+30)
-    codes[light] = '\x1b[%i;01m' % (i+30)
+    codes[dark] = '\x1b[%im' % (i + 30)
+    codes[light] = '\x1b[%i;01m' % (i + 30)
 
 _orig_codes = codes.copy()
 
diff --git a/sphinx/util/docutils.py b/sphinx/util/docutils.py
index ad80ac7a7..ae106c190 100644
--- a/sphinx/util/docutils.py
+++ b/sphinx/util/docutils.py
@@ -31,7 +31,7 @@ if False:
     from sphinx.environment import BuildEnvironment  # NOQA
 
 
-__version_info__  = tuple(map(int, docutils.__version__.split('.')))
+__version_info__ = tuple(map(int, docutils.__version__.split('.')))
 
 
 @contextmanager
diff --git a/sphinx/util/jsdump.py b/sphinx/util/jsdump.py
index 330b5c0ee..7c60a1b70 100644
--- a/sphinx/util/jsdump.py
+++ b/sphinx/util/jsdump.py
@@ -20,8 +20,8 @@ if False:
     # For type annotation
     from typing import Any, IO, Union  # NOQA
 
-_str_re  = re.compile(r'"(\\\\|\\"|[^"])*"')
-_int_re  = re.compile(r'\d+')
+_str_re = re.compile(r'"(\\\\|\\"|[^"])*"')
+_int_re = re.compile(r'\d+')
 _name_re = re.compile(r'[a-zA-Z_]\w*')
 _nameonly_re = re.compile(r'[a-zA-Z_][a-zA-Z0-9_]*$')
 
diff --git a/sphinx/util/nodes.py b/sphinx/util/nodes.py
index 4c574c242..e50de9630 100644
--- a/sphinx/util/nodes.py
+++ b/sphinx/util/nodes.py
@@ -266,15 +266,15 @@ def process_index_entry(entry, targetid):
         main = 'main'
         entry = entry[1:].lstrip()
     for type in pairindextypes:
-        if entry.startswith(type+':'):
-            value = entry[len(type)+1:].strip()
+        if entry.startswith(type + ':'):
+            value = entry[len(type) + 1:].strip()
             value = pairindextypes[type] + '; ' + value
             indexentries.append(('pair', value, targetid, main, None))
             break
     else:
         for type in indextypes:
-            if entry.startswith(type+':'):
-                value = entry[len(type)+1:].strip()
+            if entry.startswith(type + ':'):
+                value = entry[len(type) + 1:].strip()
                 if type == 'double':
                     type = 'pair'
                 indexentries.append((type, value, targetid, main, None))
diff --git a/sphinx/util/osutil.py b/sphinx/util/osutil.py
index 5561f0ddb..ba2e1abf4 100644
--- a/sphinx/util/osutil.py
+++ b/sphinx/util/osutil.py
@@ -30,7 +30,7 @@ if False:
 # Errnos that we need.
 EEXIST = getattr(errno, 'EEXIST', 0)
 ENOENT = getattr(errno, 'ENOENT', 0)
-EPIPE  = getattr(errno, 'EPIPE', 0)
+EPIPE = getattr(errno, 'EPIPE', 0)
 EINVAL = getattr(errno, 'EINVAL', 0)
 
 # SEP separates path elements in the canonical file names
@@ -73,7 +73,7 @@ def relative_uri(base, to):
         # Special case: relative_uri('f/index.html','f/') should
         # return './', not ''
         return '.' + SEP
-    return ('..' + SEP) * (len(b2)-1) + SEP.join(t2)
+    return ('..' + SEP) * (len(b2) - 1) + SEP.join(t2)
 
 
 def ensuredir(path):
diff --git a/sphinx/util/parallel.py b/sphinx/util/parallel.py
index 1d97a511c..fc691bee1 100644
--- a/sphinx/util/parallel.py
+++ b/sphinx/util/parallel.py
@@ -140,11 +140,11 @@ def make_chunks(arguments, nproc, maxbatch=10):
     chunksize = nargs // nproc
     if chunksize >= maxbatch:
         # try to improve batch size vs. number of batches
-        chunksize = int(sqrt(nargs/nproc * maxbatch))
+        chunksize = int(sqrt(nargs / nproc * maxbatch))
     if chunksize == 0:
         chunksize = 1
     nchunks, rest = divmod(nargs, chunksize)
     if rest:
         nchunks += 1
     # partition documents in "chunks" that will be written by one Process
-    return [arguments[i*chunksize:(i+1)*chunksize] for i in range(nchunks)]
+    return [arguments[i * chunksize:(i + 1) * chunksize] for i in range(nchunks)]
diff --git a/sphinx/util/stemmer/porter.py b/sphinx/util/stemmer/porter.py
index 7cff74b6c..5f8d14ed6 100644
--- a/sphinx/util/stemmer/porter.py
+++ b/sphinx/util/stemmer/porter.py
@@ -107,7 +107,7 @@ class PorterStemmer(object):
         """doublec(j) is TRUE <=> j,(j-1) contain a double consonant."""
         if j < (self.k0 + 1):
             return 0
-        if (self.b[j] != self.b[j-1]):
+        if (self.b[j] != self.b[j - 1]):
             return 0
         return self.cons(j)
 
@@ -120,8 +120,8 @@ class PorterStemmer(object):
            cav(e), lov(e), hop(e), crim(e), but
            snow, box, tray.
         """
-        if i < (self.k0 + 2) or not self.cons(i) or self.cons(i-1) \
-           or not self.cons(i-2):
+        if i < (self.k0 + 2) or not self.cons(i) or self.cons(i - 1) \
+           or not self.cons(i - 2):
             return 0
         ch = self.b[i]
         if ch == 'w' or ch == 'x' or ch == 'y':
@@ -135,7 +135,7 @@ class PorterStemmer(object):
             return 0
         if length > (self.k - self.k0 + 1):
             return 0
-        if self.b[self.k-length+1:self.k+1] != s:
+        if self.b[self.k - length + 1:self.k + 1] != s:
             return 0
         self.j = self.k - length
         return 1
@@ -144,7 +144,7 @@ class PorterStemmer(object):
         """setto(s) sets (j+1),...k to the characters in the string s,
         readjusting k."""
         length = len(s)
-        self.b = self.b[:self.j+1] + s + self.b[self.j+length+1:]
+        self.b = self.b[:self.j + 1] + s + self.b[self.j + length + 1:]
         self.k = self.j + length
 
     def r(self, s):
@@ -203,7 +203,7 @@ class PorterStemmer(object):
         """step1c() turns terminal y to i when there is another vowel in
         the stem."""
         if (self.ends("y") and self.vowelinstem()):
-            self.b = self.b[:self.k] + 'i' + self.b[self.k+1:]
+            self.b = self.b[:self.k] + 'i' + self.b[self.k + 1:]
 
     def step2(self):
         """step2() maps double suffices to single ones.
@@ -376,7 +376,7 @@ class PorterStemmer(object):
         self.j = self.k
         if self.b[self.k] == 'e':
             a = self.m()
-            if a > 1 or (a == 1 and not self.cvc(self.k-1)):
+            if a > 1 or (a == 1 and not self.cvc(self.k - 1)):
                 self.k = self.k - 1
         if self.b[self.k] == 'l' and self.doublec(self.k) and self.m() > 1:
             self.k = self.k - 1
@@ -408,4 +408,4 @@ class PorterStemmer(object):
         self.step3()
         self.step4()
         self.step5()
-        return self.b[self.k0:self.k+1]
+        return self.b[self.k0:self.k + 1]
diff --git a/sphinx/websupport/search/__init__.py b/sphinx/websupport/search/__init__.py
index 80b5a3535..48279f0a8 100644
--- a/sphinx/websupport/search/__init__.py
+++ b/sphinx/websupport/search/__init__.py
@@ -106,7 +106,7 @@ class BaseSearch(object):
         res = self.context_re.search(text)
         if res is None:
             return ''
-        context_start = max(res.start() - int(length/2), 0)
+        context_start = max(res.start() - int(length / 2), 0)
         context_end = context_start + length
         context = ''.join([context_start > 0 and '...' or '',
                            text[context_start:context_end],
diff --git a/sphinx/writers/html.py b/sphinx/writers/html.py
index 4cc669a36..4ad77de6d 100644
--- a/sphinx/writers/html.py
+++ b/sphinx/writers/html.py
@@ -454,7 +454,7 @@ class HTMLTranslator(BaseTranslator):
                 self.body.append(self.starttag(production, 'strong', ''))
                 self.body.append(lastname + '</strong> ::= ')
             elif lastname is not None:
-                self.body.append('%s     ' % (' '*len(lastname)))
+                self.body.append('%s     ' % (' ' * len(lastname)))
             production.walkabout(self)
             self.body.append('\n')
         self.body.append('</pre>\n')
@@ -614,7 +614,7 @@ class HTMLTranslator(BaseTranslator):
                     self.body.append(token)
                 else:
                     # protect runs of multiple spaces; the last one can wrap
-                    self.body.append('&#160;' * (len(token)-1) + ' ')
+                    self.body.append('&#160;' * (len(token) - 1) + ' ')
         else:
             if self.in_mailto and self.settings.cloak_email_addresses:
                 encoded = self.cloak_email(encoded)
diff --git a/sphinx/writers/latex.py b/sphinx/writers/latex.py
index 221d2b2ac..64b975741 100644
--- a/sphinx/writers/latex.py
+++ b/sphinx/writers/latex.py
@@ -1793,7 +1793,7 @@ class LaTeXTranslator(nodes.NodeVisitor):
         parindex = node.parent.index(node)
         try:
             try:
-                next = node.parent[parindex+1]
+                next = node.parent[parindex + 1]
             except IndexError:
                 # last node in parent, look at next after parent
                 # (for section of equal level) if it exists
@@ -1856,14 +1856,14 @@ class LaTeXTranslator(nodes.NodeVisitor):
                 elif type == 'pair':
                     p1, p2 = [self.encode(x) for x in split_into(2, 'pair', string)]
                     self.body.append(r'\index{%s!%s%s}\index{%s!%s%s}' %
-                                     (p1, p2, m,  p2, p1, m))
+                                     (p1, p2, m, p2, p1, m))
                 elif type == 'triple':
                     p1, p2, p3 = [self.encode(x)
                                   for x in split_into(3, 'triple', string)]
                     self.body.append(
                         r'\index{%s!%s %s%s}\index{%s!%s, %s%s}'
                         r'\index{%s!%s %s%s}' %
-                        (p1, p2, p3, m,  p2, p3, p1, m,  p3, p1, p2, m))
+                        (p1, p2, p3, m, p2, p3, p1, m, p3, p1, p2, m))
                 elif type == 'see':
                     p1, p2 = [self.encode(x) for x in split_into(2, 'see', string)]
                     self.body.append(r'\index{%s|see{%s}}' % (p1, p2))
diff --git a/sphinx/writers/manpage.py b/sphinx/writers/manpage.py
index 76b402462..e3ce3ed7a 100644
--- a/sphinx/writers/manpage.py
+++ b/sphinx/writers/manpage.py
@@ -263,7 +263,7 @@ class ManualPageTranslator(BaseTranslator):
                 self.body.append(self.defs['strong'][1])
                 self.body.append(' ::= ')
             elif lastname is not None:
-                self.body.append('%s     ' % (' '*len(lastname)))
+                self.body.append('%s     ' % (' ' * len(lastname)))
             production.walkabout(self)
             self.body.append('\n')
         self.body.append('\n.fi\n')
diff --git a/sphinx/writers/texinfo.py b/sphinx/writers/texinfo.py
index a992869e3..07a0e1e83 100644
--- a/sphinx/writers/texinfo.py
+++ b/sphinx/writers/texinfo.py
@@ -345,10 +345,10 @@ class TexinfoTranslator(nodes.NodeVisitor):
             for i, id in enumerate(entries):
                 # First child's prev is empty
                 if i != 0:
-                    rellinks[id][1] = entries[i-1]
+                    rellinks[id][1] = entries[i - 1]
                 # Last child's next is empty
                 if i != len(entries) - 1:
-                    rellinks[id][0] = entries[i+1]
+                    rellinks[id][0] = entries[i + 1]
         # top's next is its first child
         try:
             first = node_menus['Top'][0]
@@ -416,7 +416,7 @@ class TexinfoTranslator(nodes.NodeVisitor):
             s = '* %s: %s. ' % (name, node_name)
         offset = max((24, (len(name) + 4) % 78))
         wdesc = '\n'.join(' ' * offset + l for l in
-                          textwrap.wrap(desc, width=78-offset))
+                          textwrap.wrap(desc, width=78 - offset))
         return s + wdesc.strip() + '\n'
 
     def add_menu_entries(self, entries, reg=re.compile(r'\s+---?\s+')):
@@ -698,7 +698,7 @@ class TexinfoTranslator(nodes.NodeVisitor):
         parindex = node.parent.index(node)
         try:
             try:
-                next = node.parent[parindex+1]
+                next = node.parent[parindex + 1]
             except IndexError:
                 # last node in parent, look at next after parent
                 # (for section of equal level)
@@ -1110,7 +1110,7 @@ class TexinfoTranslator(nodes.NodeVisitor):
             return
         self.body.append('\n\n@multitable ')
         for i, n in enumerate(self.colwidths):
-            self.body.append('{%s} ' % ('x' * (n+2)))
+            self.body.append('{%s} ' % ('x' * (n + 2)))
 
     def depart_colspec(self, node):
         # type: (nodes.Node) -> None
@@ -1450,7 +1450,7 @@ class TexinfoTranslator(nodes.NodeVisitor):
                     self.add_anchor(id, production)
                 s = production['tokenname'].ljust(maxlen) + ' ::='
             else:
-                s = '%s    ' % (' '*maxlen)
+                s = '%s    ' % (' ' * maxlen)
             self.body.append(self.escape(s))
             self.body.append(self.escape(production.astext() + '\n'))
         self.depart_literal_block(None)
diff --git a/sphinx/writers/text.py b/sphinx/writers/text.py
index 9bd427468..46de7a582 100644
--- a/sphinx/writers/text.py
+++ b/sphinx/writers/text.py
@@ -98,7 +98,7 @@ class TextWrapper(textwrap.TextWrapper):
         for i, c in enumerate(word):
             total += column_width(c)
             if total > space_left:
-                return word[:i-1], word[i-1:]
+                return word[:i - 1], word[i - 1:]
         return word, ''
 
     def _split(self, text):
@@ -213,7 +213,7 @@ class TextTranslator(nodes.NodeVisitor):
             if not toformat:
                 return
             if wrap:
-                res = my_wrap(''.join(toformat), width=MAXWIDTH-maxindent)
+                res = my_wrap(''.join(toformat), width=MAXWIDTH - maxindent)
             else:
                 res = ''.join(toformat).splitlines()
             if end:
@@ -246,7 +246,7 @@ class TextTranslator(nodes.NodeVisitor):
     def depart_document(self, node):
         # type: (nodes.Node) -> None
         self.end_state()
-        self.body = self.nl.join(line and (' '*indent + line)
+        self.body = self.nl.join(line and (' ' * indent + line)
                                  for indent, lines in self.states[0]
                                  for line in lines)
         # XXX header/footer?
@@ -304,7 +304,7 @@ class TextTranslator(nodes.NodeVisitor):
     def visit_title(self, node):
         # type: (nodes.Node) -> None
         if isinstance(node.parent, nodes.Admonition):
-            self.add_text(node.astext()+': ')
+            self.add_text(node.astext() + ': ')
             raise nodes.SkipNode
         self.new_state(0)
 
@@ -468,7 +468,7 @@ class TextTranslator(nodes.NodeVisitor):
                 self.add_text(production['tokenname'].ljust(maxlen) + ' ::=')
                 lastname = production['tokenname']
             elif lastname is not None:
-                self.add_text('%s    ' % (' '*len(lastname)))
+                self.add_text('%s    ' % (' ' * len(lastname)))
             self.add_text(production.astext() + self.nl)
         self.end_state(wrap=False)
         raise nodes.SkipNode
@@ -657,7 +657,7 @@ class TextTranslator(nodes.NodeVisitor):
             # type: (unicode) -> None
             out = ['+']  # type: List[unicode]
             for width in realwidths:
-                out.append(char * (width+2))
+                out.append(char * (width + 2))
                 out.append('+')
             self.add_text(''.join(out) + self.nl)
 
diff --git a/utils/check_sources.py b/utils/check_sources.py
index d4a5ab491..3858cc0b4 100755
--- a/utils/check_sources.py
+++ b/utils/check_sources.py
@@ -34,7 +34,7 @@ def checker(*suffixes, **kwds):
 
 
 # this one is a byte regex since it is applied before decoding
-coding_re    = re.compile(br'coding[:=]\s*([-\w.]+)')
+coding_re = re.compile(br'coding[:=]\s*([-\w.]+)')
 
 uni_coding_re = re.compile(r'^#.*coding[:=]\s*([-\w.]+).*')
 name_mail_re = r'[\w ]+(<.*?>)?'
@@ -44,9 +44,9 @@ copyright_re = re.compile(r'^    :copyright: Copyright 200\d(-20\d\d)? '
 license_re = re.compile(r"    :license: (.*?).\n")
 copyright_2_re = re.compile(r'^                %s(, %s)*[,.]$' %
                             (name_mail_re, name_mail_re))
-not_ix_re    = re.compile(r'\bnot\s+\S+?\s+i[sn]\s\S+')
-is_const_re  = re.compile(r'if.*?==\s+(None|False|True)\b')
-noqa_re      = re.compile(r'#\s+NOQA\s*$', re.I)
+not_ix_re = re.compile(r'\bnot\s+\S+?\s+i[sn]\s\S+')
+is_const_re = re.compile(r'if.*?==\s+(None|False|True)\b')
+noqa_re = re.compile(r'#\s+NOQA\s*$', re.I)
 
 misspellings = ["developement", "adress",  # ALLOW-MISSPELLING
                 "verificate", "informations"]  # ALLOW-MISSPELLING
@@ -64,7 +64,7 @@ def decode_source(fn, lines):
             decoded_lines.append(line.decode(encoding))
         except UnicodeDecodeError as err:
             raise UnicodeError("%s:%d: not decodable: %s\n   Line: %r" %
-                               (fn, lno+1, err, line))
+                               (fn, lno + 1, err, line))
         except LookupError as err:
             raise LookupError("unknown encoding: %s" % encoding)
     return decoded_lines
@@ -85,14 +85,14 @@ def check_style(fn, lines):
         if noqa_re.search(line):
             continue
         if len(line.rstrip('\n')) > 95:
-            yield lno+1, "line too long"
+            yield lno + 1, "line too long"
         if line.strip().startswith('#'):
             continue
         # m = not_ix_re.search(line)
         # if m:
         #     yield lno+1, '"' + m.group() + '"'
         if is_const_re.search(line):
-            yield lno+1, 'using == None/True/False'
+            yield lno + 1, 'using == None/True/False'
 
 
 @checker('.py', only_pkg=True)
@@ -119,11 +119,11 @@ def check_fileheader(fn, lines):
             if l == '"""\n':
                 # end of docstring
                 if lno <= 4:
-                    yield lno+c, "missing module name in docstring"
+                    yield lno + c, "missing module name in docstring"
                 break
 
             if l != '\n' and l[:4] != '    ' and docopen:
-                yield lno+c, "missing correct docstring indentation"
+                yield lno + c, "missing correct docstring indentation"
 
             if lno == 2:
                 # if not in package, don't check the module name
@@ -148,10 +148,10 @@ def check_fileheader(fn, lines):
         yield 0, "no correct license info"
 
     ci = -3
-    copyright = llist[ci:ci+1]
+    copyright = llist[ci:ci + 1]
     while copyright and copyright_2_re.match(copyright[0]):
         ci -= 1
-        copyright = llist[ci:ci+1]
+        copyright = llist[ci:ci + 1]
     if not copyright or not copyright_re.match(copyright[0]):
         yield 0, "no correct copyright info"
 
@@ -160,12 +160,12 @@ def check_fileheader(fn, lines):
 def check_whitespace_and_spelling(fn, lines):
     for lno, line in enumerate(lines):
         if '\t' in line:
-            yield lno+1, "OMG TABS!!!1 "
+            yield lno + 1, "OMG TABS!!!1 "
         if line[:-1].rstrip(' \t') != line[:-1]:
-            yield lno+1, "trailing whitespace"
+            yield lno + 1, "trailing whitespace"
         for word in misspellings:
             if word in line and 'ALLOW-MISSPELLING' not in line:
-                yield lno+1, '"%s" used' % word
+                yield lno + 1, '"%s" used' % word
 
 
 bad_tags = ['<u>', '<s>', '<strike>', '<center>', '<font']
@@ -176,7 +176,7 @@ def check_xhtml(fn, lines):
     for lno, line in enumerate(lines):
         for bad_tag in bad_tags:
             if bad_tag in line:
-                yield lno+1, "used " + bad_tag
+                yield lno + 1, "used " + bad_tag
 
 
 def main(argv):
diff --git a/utils/jssplitter_generator.py b/utils/jssplitter_generator.py
index e236f00d0..078dd7591 100644
--- a/utils/jssplitter_generator.py
+++ b/utils/jssplitter_generator.py
@@ -35,8 +35,8 @@ def fold(jsonData, splitter):
             lines.append('        ' + code)
             break
         index = code.index(splitter, 70)
-        lines.append('        ' + code[:index+len(splitter)])
-        code = code[index+len(splitter):]
+        lines.append('        ' + code[:index + len(splitter)])
+        code = code[index + len(splitter):]
     lines[0] = lines[0][8:]
     return '\n'.join(lines)
 
diff --git a/utils/reindent.py b/utils/reindent.py
index a4fe93e24..b79657636 100755
--- a/utils/reindent.py
+++ b/utils/reindent.py
@@ -55,9 +55,9 @@ if sys.version_info >= (3, 0):
 else:
     tokens = tokenize.tokenize
 
-verbose    = 0
-recurse    = 0
-dryrun     = 0
+verbose = 0
+recurse = 0
+dryrun = 0
 makebackup = True
 
 
@@ -160,7 +160,7 @@ def _rstrip(line, JUNK='\n \t'):
     """
 
     i = len(line)
-    while i > 0 and line[i-1] in JUNK:
+    while i > 0 and line[i - 1] in JUNK:
         i -= 1
     return line[:i]
 
@@ -204,9 +204,9 @@ class Reindenter:
         # we see a line with *something* on it.
         i = stats[0][0]
         after.extend(lines[1:i])
-        for i in range(len(stats)-1):
+        for i in range(len(stats) - 1):
             thisstmt, thislevel = stats[i]
-            nextstmt = stats[i+1][0]
+            nextstmt = stats[i + 1][0]
             have = getlspace(lines[thisstmt])
             want = thislevel * 4
             if want < 0:
@@ -218,7 +218,7 @@ class Reindenter:
                     want = have2want.get(have, -1)
                     if want < 0:
                         # Then it probably belongs to the next real stmt.
-                        for j in range(i+1, len(stats)-1):
+                        for j in range(i + 1, len(stats) - 1):
                             jline, jlevel = stats[j]
                             if jlevel >= 0:
                                 if have == getlspace(lines[jline]):
@@ -228,10 +228,10 @@ class Reindenter:
                                         # comment like this one,
                         # in which case we should shift it like its base
                         # line got shifted.
-                        for j in range(i-1, -1, -1):
+                        for j in range(i - 1, -1, -1):
                             jline, jlevel = stats[j]
                             if jlevel >= 0:
-                                want = (have + getlspace(after[jline-1]) -
+                                want = (have + getlspace(after[jline - 1]) -
                                         getlspace(lines[jline]))
                                 break
                     if want < 0: