def check_archive_formats(formats):
    """Returns the first format from the 'format' list that is unknown.

    If all formats are known, returns None
    """
    for format in formats:
        if ARCHIVE_FORMATS not in format:
            return format
    return None
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/distutils/archive_util.py/check_archive_formats/swapped operands of `not in`