fname : str, or None
Filename of the log to print to. If None, stdout is used.
To suppress log outputs, use set_log_level(‘WARN’).
output_format : str
Format of the output messages. See the following for examples:
e.g., “%(asctime)s - %(levelname)s - %(message)s”.
overwrite : bool, or None
Overwrite the log file (if it exists). Otherwise, statements
will be appended to the log (default). None is the same as False,
but additionally raises a warning to notify the user that log
entries will be appended.
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