Zachary Ware added the comment: Here's some pretty compelling evidence for a bad PYTHONHOME setting:
C:\>set PYTHONHOME=C:\path\not\here C:\>py -3.5 Fatal Python error: Py_Initialize: unable to load the file system codec ImportError: No module named 'encodings' Current thread 0x00001db4 (most recent call first): C:\>set PYTHONHOME=C:\Python27\ C:\>py -3.5 Fatal Python error: Py_Initialize: unable to load the file system codec File "C:\Python27\\lib\encodings\__init__.py", line 123 raise CodecRegistryError,\ ^ SyntaxError: invalid syntax Current thread 0x00000664 (most recent call first): C:\>set PYTHONHOME= C:\>py -3.5 Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27054> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com