Implemented fix for https://github.com/ipython/ipython/issues/1107 by checking that the module list only returns importable modules.

IPython/core/completerlib.py

@@ -80,10 +80,15 b' def module_list(path):'
     pjoin = os.path.join
     basename = os.path.basename
 
+    def is_importable_file(path):
+        """Returns True if the provided path is a valid importable module"""
+        name, extension = os.path.splitext( path )
+        return import_re.match(path) and py3compat.isidentifier(name)
+
     # Now find actual path matches for packages or modules
     folder_list = [p for p in folder_list
                    if isfile(pjoin(path, p,'__init__.py'))
-                   or import_re.match(p) ]
+                   or is_importable_file(p) ]
 
     return [basename(p).split('.')[0] for p in folder_list]
 

IPython/core/tests/test_completerlib.py

@@ -76,4 +76,5 b' class Test_magic_run_completer(unittest.TestCase):'
                 open(filename, 'w').close()
 
             s = set( module_completion('import foo') )
-            self.assertFalse( s.intersection(invalid_module_names) )
+            intersection = s.intersection(invalid_module_names)
+            self.assertFalse(intersection, intersection)