Method rotate

Lib/logging/handlers.py:104–123

When rotating, rotate the current log. The default implementation calls the 'rotator' attribute of the handler, if it's callable, passing the source and dest arguments to it. If the attribute isn't callable (the default is None), the source is simply renamed

(self, source, dest)

        return result

    def rotate(self, source, dest):
        """
        When rotating, rotate the current log.

        The default implementation calls the 'rotator' attribute of the
        handler, if it's callable, passing the source and dest arguments to
        it. If the attribute isn't callable (the default is None), the source
        is simply renamed to the destination.

        :param source: The source filename. This is normally the base
                       filename, e.g. 'test.log'
        :param dest:   The destination filename. This is normally
                       what the source is rotated to, e.g. 'test.log.1'.
        """
        if not callable(self.rotator):
            # Issue 18940: A file may not have been created if delay is True.
            if os.path.exists(source):
                os.rename(source, dest)
        else:
            self.rotator(source, dest)

class RotatingFileHandler(BaseRotatingHandler):
    """