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.
>>>
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<http://bugs.python.org/issue27054>
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