TypeError: '_FlagValues' object is not iterable

[ljh10057]

File "main.py", line 70, in main
flags_dict = {k:FLAGS[k].value for k in FLAGS}
TypeError: '_FlagValues' object is not iterable
Help, has anyone encountered this problem？

[lihh1023]

您好：       来信我已收到，我会尽快回复的。