Issue #7732: Don't open a directory as a file anymore while importing a

module. Ignore the direcotry if its name matchs the module name (e.g.
"__init__.py") and raise a ImportError instead.

Lib/test/test_import.py

@@ -139,6 +139,15 @@ class ImportTests(unittest.TestCase):
             self.assertIs(orig_path, new_os.path)
             self.assertIsNot(orig_getenv, new_os.getenv)
 
+    def test_bug7732(self):
+        source = TESTFN + '.py'
+        os.mkdir(source)
+        try:
+            self.assertRaisesRegex(ImportError, '^No module',
+                imp.find_module, TESTFN, ["."])
+        finally:
+            os.rmdir(source)
+
     def test_module_with_large_stack(self, module='longlist'):
         # Regression test for http://bugs.python.org/issue561858.
         filename = module + '.py'

Misc/NEWS

@@ -10,6 +10,10 @@ What's New in Python 3.2.3?
 Core and Builtins
 -----------------
 
+- Issue #7732: Don't open a directory as a file anymore while importing a
+  module. Ignore the direcotry if its name matchs the module name (e.g.
+  "__init__.py") and raise a ImportError instead.
+
 - Issue #13021: Missing decref on an error path.  Thanks to Suman Saha for
   finding the bug and providing a patch.
 
@@ -77,7 +81,7 @@ Tests
 
 Extension Modules
 -----------------
- 
+
 - Issue #13022: Fix: _multiprocessing.recvfd() doesn't check that
   file descriptor was actually received.
 

Python/import.c

@@ -1763,6 +1763,7 @@ find_module(char *fullname, char *subname, PyObject *path, char *buf,
         saved_namelen = namelen;
 #endif /* PYOS_OS2 */
         for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) {
+            struct stat statbuf;
 #if defined(PYOS_OS2) && defined(HAVE_DYNAMIC_LOADING)
             /* OS/2 limits DLLs to 8 character names (w/o
                extension)
@@ -1791,10 +1792,16 @@ find_module(char *fullname, char *subname, PyObject *path, char *buf,
             strcpy(buf+len, fdp->suffix);
             if (Py_VerboseFlag > 1)
                 PySys_WriteStderr("# trying %s\n", buf);
+
             filemode = fdp->mode;
             if (filemode[0] == 'U')
                 filemode = "r" PY_STDIOTEXTMODE;
-            fp = fopen(buf, filemode);
+
+            if (stat(buf, &statbuf) == 0 && S_ISDIR(statbuf.st_mode))
+                /* it's a directory */
+                fp = NULL;
+            else
+                fp = fopen(buf, filemode);
             if (fp != NULL) {
                 if (case_ok(buf, len, namelen, name))
                     break;