How to change filehandle with Python logging on the fly with different classes and imports

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Indeed, logging.basicConfig does nothing if a handler has been set up already:

This function does nothing if the root logger already has handlers configured, unless the keyword argument force is set to True.

You’ll need to either add force=True (requires Python 3.8 or newer), or, alternatively, replace the current handler on the root logger:

import logging

fileh = logging.FileHandler('/tmp/logfile', 'a')
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
fileh.setFormatter(formatter)

log = logging.getLogger()  # root logger
for hdlr in log.handlers[:]:  # remove all old handlers
    log.removeHandler(hdlr)
log.addHandler(fileh)      # set the new handler

See the Configuring Logging chapter in the Python Logging HOWTO.

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