Fix `sphinx.ext.intersphinx crashes if non-string value is used for key of intersphinx_mapping`

CHANGES

@@ -58,6 +58,7 @@ Bugs fixed
 * #2517: wrong bookmark encoding in PDF if using LuaLaTeX
 * #2521: generated Makefile causes BSD make crashed if sphinx-build not found
 * #2470: ``typing`` backport package causes autodoc errors with python 2.7
+* ``sphinx.ext.intersphinx`` crashes if non-string value is used for key of `intersphinx_mapping`
 
 
 Release 1.4.1 (released Apr 12, 2016)

sphinx/ext/intersphinx.py

@@ -33,7 +33,7 @@ import posixpath
 from os import path
 import re
 
-from six import iteritems
+from six import iteritems, string_types
 from six.moves.urllib import parse, request
 from docutils import nodes
 from docutils.utils import relative_path
@@ -271,7 +271,10 @@ def load_mappings(app):
         if isinstance(value, tuple):
             # new format
             name, (uri, inv) = key, value
-            if not name.isalnum():
+            if not isinstance(name, string_types):
+                app.warn('intersphinx identifier %r is not string. Ignored' % name)
+                continue
+            elif not name.isalnum():
                 app.warn('intersphinx identifier %r is not alphanumeric' % name)
         else:
             # old format, no name

tests/test_ext_intersphinx.py

@@ -170,13 +170,14 @@ def test_load_mappings_warnings(tempdir, app, status, warning):
         'py3k': ('https://docs.python.org/py3k/', inv_file),
         'repoze.workflow': ('http://docs.repoze.org/workflow/', inv_file),
         'django-taggit': ('http://django-taggit.readthedocs.org/en/latest/',
-                          inv_file)
+                          inv_file),
+        12345: ('http://www.sphinx-doc.org/en/stable/', inv_file),
     }
 
     app.config.intersphinx_cache_limit = 0
     # load the inventory and check if it's done correctly
     load_mappings(app)
-    assert warning.getvalue().count('\n') == 2
+    assert warning.getvalue().count('\n') == 3
 
 
 class TestStripBasicAuth(unittest.TestCase):