request.py 文件源码

def download(self, url, filename, timeout=None):
        """Download a file by its URL.
        Args:
            url (str): The web location we want to retrieve.
            timeout (Optional[int|float]): If this value is specified, use it as the read timeout
                from the server (instead of the one specified during creation of the connection
                pool).

          filename:
            The filename within the path to download the file.

        """
        buf = self.retrieve(url, timeout=timeout)
        with open(filename, 'wb') as fobj:
            fobj.write(buf)