util.py 文件源码

def warning():
    def _warnformat(msg, category, filename, lineno, file=None, line=None):
        return '%s:%s: %s: %s\n' % (filename, lineno, category.__name__, msg)

    default_warn_format = warnings.formatwarning
    try:
        warnings.formatwarning = _warnformat
        yield warnings.warn
    finally:
        warnings.formatwarning = default_warn_format


# Descriptor protocol for creating an attribute that is bound to an
# (arbitrarily nested) attribute accessible to the instance at runtime.