How to automatically direct print statements' outputs to a file in python? [duplicate]

Question

I have a python script, it contains print statements here and there for debugging purposes. Now I find it hard to read them in console. Does python have any libraries which will automatically direct all print statements' outputs to a specified text file? I use Windows 7 by the way, not Linux. I also don't run my scripts from command line.

So what I want is something like below:

import logger_module log_file = "log.txt" logger_module.activate_logging(log_file) print "blablabla"

When I run the script above, I should see "blablabla" in log.txt file.

How about using redirection? python script_name.py > output.txt — falsetru
– falsetru, Commented Jan 3, 2014 at 6:52
But I want to run the script inside the script, not from command line. — alwbtc
– alwbtc, Commented Jan 3, 2014 at 6:54
@alwbtc Make logging.log calls instead of prints, this wasn't meant solve your exact problem, but it seems appropriate for debugging — user3072164
– user3072164, Commented Jan 3, 2014 at 6:56

Madison May · Accepted Answer · 2014-01-03 07:34:58Z

2

I believe this is the closest you'll get:

import sys sys.stdout = open('file', 'w') print 'test' # prints test to file

If you'd like to write to multiple locations, you can use the following. Any object with a write method can be assigned to sys.stdout in python.

import sys class Logger(object): def __init__(self, *files): self.files = files def write(self, obj): for f in self.files: f.write(obj) f = open('file', 'w') sys.stdout = Logger(f, sys.stdout) print "Python Magic"

edited Jan 3, 2014 at 7:34

answered Jan 3, 2014 at 7:15

Madison May

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4 Comments

alwbtc Over a year ago

Great. Could you please show how to write both to console and file? Because your answer just writes to file.

alwbtc Over a year ago

Thanks for the edit, but I didn't mean multiple files, I wanted to to say, how to write both to a file and to the shell window?

Madison May Over a year ago

That code should work for that purpose. The shell window is more or less a "file" in the sense that you can write to it. Give it a go and let me know if it works for you.

alwbtc Over a year ago

Sir, thank you. Do big python software projects handle loggings this way?

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