钟摆。周期实例。如何从中获得时间

不管我在句号A之后放了什么,都得0分。为什么?

import pendulum

home = 'Europe/Berlin'
away = 'America/New_york'

a = pendulum.now(home)
b = pendulum.now(away)
print(a)
print(b)
dif = b.diff(a)
print (dif)
di = dif.in_hours()
print (di)
d = dif.hours
print (d)

输出:

2019-02-23T21:20:22.738058+01:00

2019-02-23T15:20:22.738058-05:00

Period [2019-02-23T15:20:22.738058-05:00 -> 2019-02-23T21:20:22.738058+01:00]

0

0