Python: Logging TypeError: not all arguments converted during string formatting

Question

Here is what I am doing

>>> import logging
>>> logging.getLogger().setLevel(logging.INFO)
>>> from datetime import date
>>&g         


        

Answer 1

Martijn's answer is correct, but if you prefer to use new style formatting with logging, it can be accomplished by subclassing Logger.

import logging

class LogRecord(logging.LogRecord):
    def getMessage(self):
        msg = self.msg
        if self.args:
            if isinstance(self.args, dict):
                msg = msg.format(**self.args)
            else:
                msg = msg.format(*self.args)
        return msg

class Logger(logging.Logger):
    def makeRecord(self, name, level, fn, lno, msg, args, exc_info, func=None, extra=None):
        rv = LogRecord(name, level, fn, lno, msg, args, exc_info, func)
        if extra is not None:
            for key in extra:
                rv.__dict__[key] = extra[key]
        return rv

Then just set the logging class:

logging.setLoggerClass(Logger)