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I am currently running a python script in a batch file. In the python, I have some print function to monitor the running code. The printed information then will be shown in the command window. In the meantime, I also want to save all these print-out text to a log-file, so I can track them in the long run.

Currently, to do this, I need to have both print function in the python and use the text.write function to write to a text file. This causes some troubles in maintenance because every time I change some printing text, I also need to change the text in the write function. Also I feel it is not the most efficient way to do that.

For example:

start_time = datetime.now()
print("This code is run at " + str(start_time) + "\n")
log_file.write("This code is run at " + str(start_time) + "\n")

I would like to use the print function in the python, so I can see that in the command window and then save all the print-out information to a log file at one time.

HoldOffHunger
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Shenan
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2 Answers2

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For a better solution in the long run, consider the built in logging module. You can give multiple destinations, such as stdout and files, log rotation, formatting, and importance levels.

Example: 

import logging
logging.basicConfig(filename='log_file', filemode='w', level=logging.DEBUG)

logging.info("This code is run at %", start_time)
Brian
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  • Thank you for the suggestion, but I am not familiar with logging package. I have tried the code and it outputs too many info. Since my current project is a small program I am afraid this might be an overkill. – Shenan Aug 08 '19 at 19:14
0

Just make a function

def print_and_log(text):
    print(text)
    with open("logfile.txt", "a") as logfile:
        logfile.write(text+"\n")

Then wherever you need to print, use this function and it will also log.

whackamadoodle3000
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