smtp.py 文件源码

def _getContextFactory(self):
        if self.context is not None:
            return self.context
        try:
            from twisted.internet import ssl
        except ImportError:
            return None
        else:
            try:
                context = ssl.ClientContextFactory()
                context.method = ssl.SSL.TLSv1_METHOD
                return context
            except AttributeError:
                return None