1138653.

redirected, using select() or threads is unnecessary.

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var == None and var != None
with
var is None and var is not None

and type(var) == int
with
instanceof(var, int)

...as recomended in PEP 8 [1].

prevent leaving zombies.

Changed signature of call function to avoid confusion: this 'args' is not the same as the one to the Popen constructor

want to use pywin32 instead of _subprocess, you have to edit the file.