urllib2.py 文件源码

def file_open(self, req):
        url = req.get_selector()
        if url[:2] == '//' and url[2:3] != '/' and (req.host and
                req.host != 'localhost'):
            req.type = 'ftp'
            return self.parent.open(req)
        else:
            return self.open_local_file(req)

    # names for the localhost