tuple with 3 elements: strings '%H:%M:%S', '%H:%M:%S.%f' and '%H:%M' for 'TIME_INPUT_FORMATS', tuple with 4 elements: strings '%Y-%m-%d %H:%M:%S', '%Y-%m-%d %H:%M:%S.%f', '%Y-%m-%d %H:%M' and '%Y-%m-%d' for 'DATETIME_INPUT_FORMATS'. define the function reset_format_cache.
def reset_format_cache ( ) :