langhelpers.py 文件源码

def warn(msg, stacklevel=3):
    """Issue a warning.

    If msg is a string, :class:`.exc.SAWarning` is used as
    the category.

    .. note::

       This function is swapped out when the test suite
       runs, with a compatible version that uses
       warnings.warn_explicit, so that the warnings registry can
       be controlled.

    """
    if isinstance(msg, compat.string_types):
        warnings.warn(msg, exc.SAWarning, stacklevel=stacklevel)
    else:
        warnings.warn(msg, stacklevel=stacklevel)