test_support.py 文件源码

def check_py3k_warnings(*filters, **kwargs):
    """Context manager to silence py3k warnings.

    Accept 2-tuples as positional arguments:
        ("message regexp", WarningCategory)

    Optional argument:
     - if 'quiet' is True, it does not fail if a filter catches nothing
        (default False)

    Without argument, it defaults to:
        check_py3k_warnings(("", DeprecationWarning), quiet=False)
    """
    if sys.py3kwarning:
        if not filters:
            filters = (("", DeprecationWarning),)
    else:
        # It should not raise any py3k warning
        filters = ()
    return _filterwarnings(filters, kwargs.get('quiet'))