Python string as file argument to subprocess

Question

I am trying to pass a file to a program (MolPro) that I start as subprocess with Python.

It most commonly takes a file as argument, like this in console:

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Answer 1

It seems like your second method should work if you remove StdinCommand from the Popen() arguments:

p = Popen(['/vol/thchem/x86_64-linux/bin/molpro'], shell = False, stdout = None, stderr = STDOUT, stdin = PIPE)
p.communicate(input = StdinCommand)