TypeError: can‘t subtract offset-naive and offset-aware datetimes

两个datetime进行时差计算报错：

TypeError: can't subtract offset-naive and offset-aware datetimes

原来是两个相减的时间时区不一致

# -*- coding: utf-8 -*-

from datetime import datetime
import pytz

now1 = datetime.now(tz=pytz.UTC)
print(now1)
# 零时区的时间 2021-06-11 04:11:39.588770+00:00


now2 = datetime.now()
print(now2)
# 东八区的时间 2021-06-11 12:12:17.431790

# print(now2 - now1)
# TypeError: can't subtract offset-naive and offset-aware datetimes

now3 = now1.replace(tzinfo=None)
print(now3)
# 去掉时区之后 2021-06-11 04:15:06.453159

print(now2 - now3)
# 8:00:00.000061

参考 python datetime offset-aware与offset-navie相互转换