Python modifying logging message info?

Question

I have a logging handler that logs warning messages to a list. But the way my scripts are constructed, the logged line number of the messages will be offseted. So I wanted to modify the capture messages with my own line number. For example, I want -20 on the line number for my logged messages.

test.py:40: DeprecationWarning: xxxxxx. test.py:20: DeprecationWarning: xxxxxx.

This is what I have so far:

class MyHandle(logging.Handler): def __init__(self, message_list): logging.Handler.__init__(self) self.message_list= message_list def emit(self, record): self.message_list.append(record.getMessage())

mattficke · Accepted Answer · 2021-03-01 03:05:34Z

The line number is a Log Record attribute, you can modify any of these attributes or add new ones by using a custom log record factory (docs).

"""custom_log.py""" import logging logging.basicConfig(format="[Line: %(lineno)d] %(message)s") old_factory = logging.getLogRecordFactory() def record_factory(*args, **kwargs): record = old_factory(*args, **kwargs) # get the unmodified record record.lineno += 5 # change the original `lineno` attribute return record logging.setLogRecordFactory(record_factory) logging.warning("This is line 14")

$ python3 custom_log.py [Line: 19] This is line 14

Hi, this did modified the line number, but when I try to format it like format="[line: %(lineno)d] %(message)s", the message attribute still contains the original line number.

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