Mark Dickinson added the comment:

I don't think the first part of the report has anything to do with 
subprocess.Popen:

>>> def f(x):
...     return
... 
>>> f()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f() missing 1 required positional argument: 'x'

See the related discussion starting at:

http://mail.python.org/pipermail/python-dev/2012-September/121760.html

----------
nosy: +mark.dickinson

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<http://bugs.python.org/issue16520>
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