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Loggify: capture prints and tracebacks to a log file with 2 lines of code

Python PyPI version license

Loggify is a convenient way to redirect stdout and stderr to the timestamped log file. It works by temporarily overriding the default behaviour of sys.stdout and sys.stderr in the context manager. You still see the output in the console - it is just additionally streamed to the log file (see the example below).

Installation

$ pip install loggify

Usage

script.py:

from loggify import Loggify

def main():
    print("START")
    for i in range(10):
        print(" " * i + "x")
    print("END")
    5 / 0   # traceback will be captured

with Loggify("main.log"):  # specify output filename
    main()

main.log:

2020-04-07 20:45:18.391:STDOUT:START
2020-04-07 20:45:18.391:STDOUT:x
2020-04-07 20:45:18.391:STDOUT: x
2020-04-07 20:45:18.391:STDOUT:  x
2020-04-07 20:45:18.391:STDOUT:   x
2020-04-07 20:45:18.391:STDOUT:    x
2020-04-07 20:45:18.391:STDOUT:     x
2020-04-07 20:45:18.391:STDOUT:      x
2020-04-07 20:45:18.391:STDOUT:       x
2020-04-07 20:45:18.391:STDOUT:        x
2020-04-07 20:45:18.391:STDOUT:         x
2020-04-07 20:45:18.392:STDOUT:END
2020-04-07 20:45:18.392:STDERR:Traceback (most recent call last):
2020-04-07 20:45:18.392:STDERR:  File "script.py", line 11, in <module>
2020-04-07 20:45:18.392:STDERR:    main()
2020-04-07 20:45:18.392:STDERR:  File "script.py", line 8, in main
2020-04-07 20:45:18.392:STDERR:    5 / 0   # traceback will be captured
2020-04-07 20:45:18.392:STDERR:ZeroDivisionError: division by zero

License

MIT License (see LICENSE).