log.py 文件源码

def deprecated(self, removal_version, msg, *args, **kwargs):
        """
        Logs deprecation message which is log level WARN if the
        ``removal_version`` is > 1 minor release away and log level ERROR
        otherwise.

        removal_version should be the version that the deprecated feature is
        expected to be removed in, so something that will not exist in
        version 1.7, but will in 1.6 would have a removal_version of 1.7.
        """
        from pip import __version__

        if should_warn(__version__, removal_version):
            self.warn(msg, *args, **kwargs)
        else:
            self.error(msg, *args, **kwargs)