Huge memory leak in repeated os.path.isdir calls?
The root cause is a failure to call PyMem_Free on the path variable in the non-Unicode path:
if (!PyArg_ParseTuple(args, "et:_isdir", Py_FileSystemDefaultEncoding, &path)) return NULL; attributes = GetFileAttributesA(path); if (attributes == INVALID_FILE_ATTRIBUTES) Py_RETURN_FALSE;check: if (attributes & FILE_ATTRIBUTE_DIRECTORY) Py_RETURN_TRUE; else Py_RETURN_FALSE;As per the documentation on PyArg_ParseTuple:
et: Same ases...es:PyArg_ParseTuple()will allocate a buffer of the needed size, copy the encoded data into this buffer and adjust *buffer to reference the newly allocated storage. The caller is responsible for callingPyMem_Free()to free the allocated buffer after use.
It's a bug in Python's standard library (fixed in Python 3 by using bytes objects directly); file a bug report at http://bugs.python.org.