Python IO: disable standard output stream and print what we want [duplicate]

Question

Say I have a python program composed of three lines.

if __name__=“__main__”: foo( ) print “Hello”

Here, foo( ) is a third-part function that outputs things to the standard output. E.g, foo( ) has only one line print 'I am here'. The point is that I have no permission to change foo() which may contain output statements, and I don't want to mix its output with mine.

Question:

How can I change the third line of the program above (print “Hello”), so that this program

1.only prints “Hello”, and

2.does not print anything from foo( )?

Thanks for your ideas.

If you want to access the value later you can store it in a StringIO object pastebin.com/NHWAjJQv — Padraic Cunningham
– Padraic Cunningham, Commented Apr 27, 2015 at 19:55

EvenLisle · Accepted Answer · 2015-04-27 19:51:02Z

You can redirect stdout to os.devnull (the null device); the following:

import os import sys def foo(): print "foo" if __name__ == "__main__": out = sys.stdout null = open(os.devnull, 'w') sys.stdout = null foo() sys.stdout = out print "Hello"

will print Hello. You can read about the null device here.

Thanks so much for your quick response. I have been looking for something like >/dev/null.
No need to thank me - rather accept my question, I don't mind the reputation ;P

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