How to redefine stderr out and stdout out to separately logs?

Question

How to redefine stderr out and stdout out to separately logs files using logging module ? For example stderr.log and stdout.log files ?

Answer 1

You can simply replace sys.stdout and sys.stderr with custom file-like objects:

import sys

sys.stdout = open('stdout.log', 'a')
sys.stderr = open('stderr.log', 'a')

To undo:

sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__

For more information, read the sys module documentation.

Answer 2

import sys


class OutDevice():
    def write(self, s):
        # do whatever
        pass

class ErrDevice():
    def write(self, s):
        # do whatever
        pass

sys.stdout = OutDevice()  
sys.stdout = ErrDevice()  

# to restore
sys.stdout = sys.__stdout__ 
sys.stderr = sys.__stderr__