To prevent a function from printing in the batch console in Python

Question

Well, the headline seems to me sufficient. I use some function that at some points print something in the console. As I can't modify them, I would like to know if there is a solution to not printing while using these functions.

Thanks a lot !

Nico

Answer 1

Yes, you can redirect sys.stdout:

import sys import os  old_stdout = sys.stdout # backup current stdout sys.stdout = open(os.devnull, "w")  my_nasty_function()  sys.stdout = old_stdout # reset old stdout 

Just replace my_nasty_function with your actual function.

EDIT: Now should work on windows aswell.

EDIT: Use backup variable to reset stdout is better when someone wraps your function again

Answer 2

Constantinius' answer answer is ok, however there is no need to actually open null device. And BTW, if you want portable null device, there is os.devnull.

Actually, all you need is a class which will ignore whatever you write to it. So more portable version would be:

class NullIO(StringIO):     def write(self, txt):        pass  sys.stdout = NullIO()  my_nasty_function()  sys.stdout = sys.__stdout__ 

.