How to log with file name?

[DeepDuke]

Usually the log looks like this, which doesn't show original filename but __main__:<module>
2023-07-04 15:30:44.302 | DEBUG | __main__:<module>:13 - Hello World!

How can we specify the configuration to show the original file name, e.g. test.py?

[changchiyou]

You need to set {file} in your format string, here is my format string as example(with VFX):

"<green>{time:YYYY-MM-DD HH:mm:ss,SSS}</green> <level>{level: <8}</level> [<cyan>{extra[mark]}</cyan>] <cyan>{file}</cyan> - <cyan>{function}</cyan>() : <level>{message}</level>"

Reference

• The record dict - Key - file
• How to adjust the time string which is inserted when rotating? #899
• How to redirect print and logging messages from third-party modules to loguru? #901
• How to process message before it's logged in specific handler? #903

[DeepDuke]

Sorry, I didn't follow u. Does it mean that logger.add(log_file_path, format=your-fmt-string)? I have tried this, but it's not working...

[Chris-fullerton]

@DeepDuke remove [<cyan>{extra[mark]}</cyan>] from @changchiyou 's format string, then it should be work.

Or, set the extra info via logger.configure(extra={"mark":"your_mark"}) and remain entire format string.

[DeepDuke]

@Chris-fullerton TKS！ It successfully printed the file name in log file. But I was curious about that the terminal output still missed the orignal file name.

This is sceenshot for log file. It showed the file name.

But for the terminal, it still printed __main__:<module>:

[Chris-fullerton]

@DeepDuke execute logger.remove() before your logger settings(multiple logger.add()) can solve your problem.

I GUESS that you have not remove the default handler which exists since you execute from luguru import logger at the first time, because the logger format in the first image you provided above

is same as the default handler.

---

Update: @DeepDuke please refer No Handler, no Formatter, no Filter: one function to rule them all 👍

Note that you may also remove() a previously added handler by using the identifier returned while adding it. This is particularly useful if you want to supersede the default stderr handler: just call logger.remove() to make a fresh start.

[DeepDuke]

@Chris-fullerton But after adding logger.remove(), the terminal will output nothing. How can I make the terminal print the same thing with the log file?

[Chris-fullerton]

@DeepDuke simply add another logger.add() to create a new handler for terminal

import sys
from loguru import logger

if __name__=="__main__":
  format = "<green>{time:YYYY-MM-DD HH:mm:ss,SSS}</green> <level>{level: <8}</level> <cyan>{file}</cyan> - <cyan>{function}</cyan>() : <level>{message}</level>"
  
  logger.remove()
  logger.add('record.log', format=format) # replace 'record.log' with your personal log object
  logger.add(sys.stderr, format=format)

  logger.debug("Hello World!")
  logger.info("This is normal info!")

[DeepDuke]

@Chris-fullerton @changchiyou Got it! Thanks for your kind help!

[Delgan]

Thanks @changchiyou and @Chris-fullerton for the support. 👍