Eryk Sun added the comment:
The "yield from" syntax was added in Python 3.3, so somehow you're using the
3.5 standard library with either an old 3.x or 2.x version. The older version
shouldn't use 3.5's standard library, unless you have either PYTHONHOME or
PYTHONPATH defined. Generally neither of these variables should be defined,
especially not PYTHONHOME. In the command prompt run "set PYTHON" to list all
environment variables that start with "PYTHON".
You also appear to be running with the 3.5 site-packages as the working
directory. Even without the other problems, I recommend against this since the
current directory has precedence in sys.path. You're moving site-packages to
the head of the list, in front of the standard library. For example:
C:\Program Files\Python35\Lib\site-packages>type subprocess.py
print("This isn't the subprocess you're looking for.")
C:\Program Files\Python35\Lib\site-packages>py -3 -c "import subprocess"
This isn't the subprocess you're looking for.
Save your scripts in the top-level Scripts directory or a directory in your
user profile. Generally leave everything under Lib alone, to be managed by pip
and other installers.
----------
nosy: +eryksun
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<http://bugs.python.org/issue26086>
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