How to duplicate sys.stdout to a log file?

Question

Edit: Since it appears that there\'s either no solution, or I\'m doing something so non-standard that nobody knows - I\'ll revise my question to also ask: What is the best w

Answer 1

I know this question has been answered repeatedly, but for this I've taken the main answer from John T's answer and modified it so it contains the suggested flush and followed its linked revised version. I've also added the enter and exit as mentioned in cladmi's answer for use with the with statement. In addition, the documentation mentions to flush files using os.fsync() so I've added that as well. I don't know if you really need that but its there.

import sys, os

class Logger(object):
    "Lumberjack class - duplicates sys.stdout to a log file and it's okay"
    #source: https://stackoverflow.com/q/616645
    def __init__(self, filename="Red.Wood", mode="a", buff=0):
        self.stdout = sys.stdout
        self.file = open(filename, mode, buff)
        sys.stdout = self

    def __del__(self):
        self.close()

    def __enter__(self):
        pass

    def __exit__(self, *args):
        self.close()

    def write(self, message):
        self.stdout.write(message)
        self.file.write(message)

    def flush(self):
        self.stdout.flush()
        self.file.flush()
        os.fsync(self.file.fileno())

    def close(self):
        if self.stdout != None:
            sys.stdout = self.stdout
            self.stdout = None

        if self.file != None:
            self.file.close()
            self.file = None

You can then use it

with Logger('My_best_girlie_by_my.side'):
    print("we'd sing sing sing")

or

Log=Logger('Sleeps_all.night')
print('works all day')
Log.close()