How to output to the console and file?

Question

I'm trying to find out a way in python to redirect the script execution log to a file as well as stdout in a pythonic way. Is there any easy way of achieving this?

Answer 1

Use logging module (http://docs.python.org/library/logging.html):

import logging  logger = logging.getLogger('scope.name')  file_log_handler = logging.FileHandler('logfile.log') logger.addHandler(file_log_handler)  stderr_log_handler = logging.StreamHandler() logger.addHandler(stderr_log_handler)  # nice output format formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') file_log_handler.setFormatter(formatter) stderr_log_handler.setFormatter(formatter)  logger.info('Info message') logger.error('Error message') 

Answer 2

I came up with this [untested]

import sys  class Tee(object):     def __init__(self, *files):         self.files = files     def write(self, obj):         for f in self.files:             f.write(obj)             f.flush() # If you want the output to be visible immediately     def flush(self) :         for f in self.files:             f.flush()  f = open('out.txt', 'w') original = sys.stdout sys.stdout = Tee(sys.stdout, f) print "test"  # This will go to stdout and the file out.txt  #use the original sys.stdout = original print "This won't appear on file"  # Only on stdout f.close() 

print>>xyz in python will expect a write() function in xyz. You could use your own custom object which has this. Or else, you could also have sys.stdout refer to your object, in which case it will be tee-ed even without >>xyz.