diff --git a/sphinx/pycode/parser.py b/sphinx/pycode/parser.py
index 1746537bb..3603e3cc3 100644
--- a/sphinx/pycode/parser.py
+++ b/sphinx/pycode/parser.py
@@ -15,10 +15,8 @@ import sys
 import tokenize
 from token import NAME, NEWLINE, INDENT, DEDENT, NUMBER, OP, STRING
 from tokenize import COMMENT, NL
+from typing import Any, Dict, List, Tuple
 
-if False:
-    # For type annotation
-    from typing import Any, Dict, List, Tuple  # NOQA
 
 comment_re = re.compile('^\\s*#: ?(.*)\r?\n?$')
 indent_re = re.compile('^\\s*$')
@@ -31,13 +29,11 @@ else:
     ASSIGN_NODES = (ast.Assign)
 
 
-def filter_whitespace(code):
-    # type: (str) -> str
+def filter_whitespace(code: str) -> str:
     return code.replace('\f', ' ')  # replace FF (form feed) with whitespace
 
 
-def get_assign_targets(node):
-    # type: (ast.AST) -> List[ast.expr]
+def get_assign_targets(node: ast.AST) -> List[ast.expr]:
     """Get list of targets from Assign and AnnAssign node."""
     if isinstance(node, ast.Assign):
         return node.targets
@@ -45,8 +41,7 @@ def get_assign_targets(node):
         return [node.target]  # type: ignore
 
 
-def get_lvar_names(node, self=None):
-    # type: (ast.AST, ast.arg) -> List[str]
+def get_lvar_names(node: ast.AST, self: ast.arg = None) -> List[str]:
     """Convert assignment-AST to variable names.
 
     This raises `TypeError` if the assignment does not create new variable::
@@ -88,11 +83,9 @@ def get_lvar_names(node, self=None):
         raise NotImplementedError('Unexpected node name %r' % node_name)
 
 
-def dedent_docstring(s):
-    # type: (str) -> str
+def dedent_docstring(s: str) -> str:
     """Remove common leading indentation from docstring."""
-    def dummy():
-        # type: () -> None
+    def dummy() -> None:
         # dummy function to mock `inspect.getdoc`.
         pass
 
@@ -104,16 +97,15 @@ def dedent_docstring(s):
 class Token:
     """Better token wrapper for tokenize module."""
 
-    def __init__(self, kind, value, start, end, source):
-        # type: (int, Any, Tuple[int, int], Tuple[int, int], str) -> None
+    def __init__(self, kind: int, value: Any, start: Tuple[int, int], end: Tuple[int, int],
+                 source: str) -> None:
         self.kind = kind
         self.value = value
         self.start = start
         self.end = end
         self.source = source
 
-    def __eq__(self, other):
-        # type: (Any) -> bool
+    def __eq__(self, other: Any) -> bool:
         if isinstance(other, int):
             return self.kind == other
         elif isinstance(other, str):
@@ -125,32 +117,27 @@ class Token:
         else:
             raise ValueError('Unknown value: %r' % other)
 
-    def match(self, *conditions):
-        # type: (Any) -> bool
+    def match(self, *conditions) -> bool:
         return any(self == candidate for candidate in conditions)
 
-    def __repr__(self):
-        # type: () -> str
+    def __repr__(self) -> str:
         return '<Token kind=%r value=%r>' % (tokenize.tok_name[self.kind],
                                              self.value.strip())
 
 
 class TokenProcessor:
-    def __init__(self, buffers):
-        # type: (List[str]) -> None
+    def __init__(self, buffers: List[str]) -> None:
         lines = iter(buffers)
         self.buffers = buffers
         self.tokens = tokenize.generate_tokens(lambda: next(lines))
         self.current = None     # type: Token
         self.previous = None    # type: Token
 
-    def get_line(self, lineno):
-        # type: (int) -> str
+    def get_line(self, lineno: int) -> str:
         """Returns specified line."""
         return self.buffers[lineno - 1]
 
-    def fetch_token(self):
-        # type: () -> Token
+    def fetch_token(self) -> Token:
         """Fetch a next token from source code.
 
         Returns ``False`` if sequence finished.
@@ -163,8 +150,7 @@ class TokenProcessor:
 
         return self.current
 
-    def fetch_until(self, condition):
-        # type: (Any) -> List[Token]
+    def fetch_until(self, condition: Any) -> List[Token]:
         """Fetch tokens until specified token appeared.
 
         .. note:: This also handles parenthesis well.
@@ -191,13 +177,11 @@ class AfterCommentParser(TokenProcessor):
     and returns the comments for variable if exists.
     """
 
-    def __init__(self, lines):
-        # type: (List[str]) -> None
+    def __init__(self, lines: List[str]) -> None:
         super().__init__(lines)
         self.comment = None  # type: str
 
-    def fetch_rvalue(self):
-        # type: () -> List[Token]
+    def fetch_rvalue(self) -> List[Token]:
         """Fetch right-hand value of assignment."""
         tokens = []
         while self.fetch_token():
@@ -217,8 +201,7 @@ class AfterCommentParser(TokenProcessor):
 
         return tokens
 
-    def parse(self):
-        # type: () -> None
+    def parse(self) -> None:
         """Parse the code and obtain comment after assignment."""
         # skip lvalue (or whole of AnnAssign)
         while not self.fetch_token().match([OP, '='], NEWLINE, COMMENT):
@@ -235,8 +218,7 @@ class AfterCommentParser(TokenProcessor):
 class VariableCommentPicker(ast.NodeVisitor):
     """Python source code parser to pick up variable comments."""
 
-    def __init__(self, buffers, encoding):
-        # type: (List[str], str) -> None
+    def __init__(self, buffers: List[str], encoding: str) -> None:
         self.counter = itertools.count()
         self.buffers = buffers
         self.encoding = encoding
@@ -248,8 +230,7 @@ class VariableCommentPicker(ast.NodeVisitor):
         self.deforders = {}             # type: Dict[str, int]
         super().__init__()
 
-    def add_entry(self, name):
-        # type: (str) -> None
+    def add_entry(self, name: str) -> None:
         if self.current_function:
             if self.current_classes and self.context[-1] == "__init__":
                 # store variable comments inside __init__ method of classes
@@ -261,8 +242,7 @@ class VariableCommentPicker(ast.NodeVisitor):
 
         self.deforders[".".join(definition)] = next(self.counter)
 
-    def add_variable_comment(self, name, comment):
-        # type: (str, str) -> None
+    def add_variable_comment(self, name: str, comment: str) -> None:
         if self.current_function:
             if self.current_classes and self.context[-1] == "__init__":
                 # store variable comments inside __init__ method of classes
@@ -274,27 +254,23 @@ class VariableCommentPicker(ast.NodeVisitor):
 
         self.comments[(context, name)] = comment
 
-    def get_self(self):
-        # type: () -> ast.arg
+    def get_self(self) -> ast.arg:
         """Returns the name of first argument if in function."""
         if self.current_function and self.current_function.args.args:
             return self.current_function.args.args[0]
         else:
             return None
 
-    def get_line(self, lineno):
-        # type: (int) -> str
+    def get_line(self, lineno: int) -> str:
         """Returns specified line."""
         return self.buffers[lineno - 1]
 
-    def visit(self, node):
-        # type: (ast.AST) -> None
+    def visit(self, node: ast.AST) -> None:
         """Updates self.previous to ."""
         super().visit(node)
         self.previous = node
 
-    def visit_Assign(self, node):
-        # type: (ast.Assign) -> None
+    def visit_Assign(self, node: ast.Assign) -> None:
         """Handles Assign node and pick up a variable comment."""
         try:
             targets = get_assign_targets(node)
@@ -334,13 +310,11 @@ class VariableCommentPicker(ast.NodeVisitor):
         for varname in varnames:
             self.add_entry(varname)
 
-    def visit_AnnAssign(self, node):
-        # type: (ast.AST) -> None
+    def visit_AnnAssign(self, node: ast.AST) -> None:  # Note: ast.AnnAssign not found in py35
         """Handles AnnAssign node and pick up a variable comment."""
         self.visit_Assign(node)  # type: ignore
 
-    def visit_Expr(self, node):
-        # type: (ast.Expr) -> None
+    def visit_Expr(self, node: ast.Expr) -> None:
         """Handles Expr node and pick up a comment if string."""
         if (isinstance(self.previous, ASSIGN_NODES) and isinstance(node.value, ast.Str)):
             try:
@@ -357,8 +331,7 @@ class VariableCommentPicker(ast.NodeVisitor):
             except TypeError:
                 pass  # this assignment is not new definition!
 
-    def visit_Try(self, node):
-        # type: (ast.Try) -> None
+    def visit_Try(self, node: ast.Try) -> None:
         """Handles Try node and processes body and else-clause.
 
         .. note:: pycode parser ignores objects definition in except-clause.
@@ -368,8 +341,7 @@ class VariableCommentPicker(ast.NodeVisitor):
         for subnode in node.orelse:
             self.visit(subnode)
 
-    def visit_ClassDef(self, node):
-        # type: (ast.ClassDef) -> None
+    def visit_ClassDef(self, node: ast.ClassDef) -> None:
         """Handles ClassDef node and set context."""
         self.current_classes.append(node.name)
         self.add_entry(node.name)
@@ -380,8 +352,7 @@ class VariableCommentPicker(ast.NodeVisitor):
         self.context.pop()
         self.current_classes.pop()
 
-    def visit_FunctionDef(self, node):
-        # type: (ast.FunctionDef) -> None
+    def visit_FunctionDef(self, node: ast.FunctionDef) -> None:
         """Handles FunctionDef node and set context."""
         if self.current_function is None:
             self.add_entry(node.name)  # should be called before setting self.current_function
@@ -392,8 +363,7 @@ class VariableCommentPicker(ast.NodeVisitor):
             self.context.pop()
             self.current_function = None
 
-    def visit_AsyncFunctionDef(self, node):
-        # type: (ast.AsyncFunctionDef) -> None
+    def visit_AsyncFunctionDef(self, node: ast.AsyncFunctionDef) -> None:
         """Handles AsyncFunctionDef node and set context."""
         self.visit_FunctionDef(node)  # type: ignore
 
@@ -403,16 +373,14 @@ class DefinitionFinder(TokenProcessor):
     classes and methods.
     """
 
-    def __init__(self, lines):
-        # type: (List[str]) -> None
+    def __init__(self, lines: List[str]) -> None:
         super().__init__(lines)
         self.decorator = None   # type: Token
         self.context = []       # type: List[str]
         self.indents = []       # type: List
         self.definitions = {}   # type: Dict[str, Tuple[str, int, int]]
 
-    def add_definition(self, name, entry):
-        # type: (str, Tuple[str, int, int]) -> None
+    def add_definition(self, name: str, entry: Tuple[str, int, int]) -> None:
         """Add a location of definition."""
         if self.indents and self.indents[-1][0] == 'def' and entry[0] == 'def':
             # ignore definition of inner function
@@ -420,8 +388,7 @@ class DefinitionFinder(TokenProcessor):
         else:
             self.definitions[name] = entry
 
-    def parse(self):
-        # type: () -> None
+    def parse(self) -> None:
         """Parse the code to obtain location of definitions."""
         while True:
             token = self.fetch_token()
@@ -442,8 +409,7 @@ class DefinitionFinder(TokenProcessor):
             elif token == DEDENT:
                 self.finalize_block()
 
-    def parse_definition(self, typ):
-        # type: (str) -> None
+    def parse_definition(self, typ: str) -> None:
         """Parse AST of definition."""
         name = self.fetch_token()
         self.context.append(name.value)
@@ -464,8 +430,7 @@ class DefinitionFinder(TokenProcessor):
             self.add_definition(funcname, (typ, start_pos, name.end[0]))
             self.context.pop()
 
-    def finalize_block(self):
-        # type: () -> None
+    def finalize_block(self) -> None:
         """Finalize definition block."""
         definition = self.indents.pop()
         if definition[0] != 'other':
@@ -484,22 +449,19 @@ class Parser:
     This is a better wrapper for ``VariableCommentPicker``.
     """
 
-    def __init__(self, code, encoding='utf-8'):
-        # type: (str, str) -> None
+    def __init__(self, code: str, encoding: str = 'utf-8') -> None:
         self.code = filter_whitespace(code)
         self.encoding = encoding
         self.comments = {}          # type: Dict[Tuple[str, str], str]
         self.deforders = {}         # type: Dict[str, int]
         self.definitions = {}       # type: Dict[str, Tuple[str, int, int]]
 
-    def parse(self):
-        # type: () -> None
+    def parse(self) -> None:
         """Parse the source code."""
         self.parse_comments()
         self.parse_definition()
 
-    def parse_comments(self):
-        # type: () -> None
+    def parse_comments(self) -> None:
         """Parse the code and pick up comments."""
         tree = ast.parse(self.code.encode())
         picker = VariableCommentPicker(self.code.splitlines(True), self.encoding)
@@ -507,8 +469,7 @@ class Parser:
         self.comments = picker.comments
         self.deforders = picker.deforders
 
-    def parse_definition(self):
-        # type: () -> None
+    def parse_definition(self) -> None:
         """Parse the location of definitions from the code."""
         parser = DefinitionFinder(self.code.splitlines(True))
         parser.parse()