mail.py 文件源码

def _gen_payload(self):
        # ???????
        if isinstance(self._attachment_file, types.FileType):
            try:
                return self._attachment_file.read()
            finally:
                self._attachment_file.close()
        # ????????
        elif isinstance(self._attachment_file, types.StringTypes):
            with open(self._attachment_file, "r") as f:
                return f.read()
        # StringIO or cStringIO
        else:
            self._attachment_file.seek(0)
            return self._attachment_file.read()