recwarn.py 文件源码

def recwarn(request):
    """Return a WarningsRecorder instance that provides these methods:

    * ``pop(category=None)``: return last warning matching the category.
    * ``clear()``: clear list of warnings

    See http://docs.python.org/library/warnings.html for information
    on warning categories.
    """
    wrec = WarningsRecorder()
    with wrec:
        warnings.simplefilter('default')
        yield wrec