Python 关于dateutil.relativedelta的问题-为什么输出总是零？

为什么此relativedelta属性的输出也为零？ 数据文件包含两个日期时间字符串，目的是获取两者之间的时间差

# python3.6 time_diff.py
0
0
0
0

# cat data
06/21/2019 21:45:24  06/21/2020 21:45:26
06/21/2019 22:42:25  06/22/2020 01:28:41
06/21/2019 22:41:32  06/21/2020 22:42:32
06/20/2019 23:42:25  06/22/2020 02:42:29

# cat time_diff.py
import dateutil.relativedelta, datetime
    
f = open("data", "r")
for line in f:
   t1 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")
   t2 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")
   rd = dateutil.relativedelta.relativedelta(t1, t2)
   print(rd.seconds)

而不是

t1 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")
t2 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")

配合

t1 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")
t2 = datetime.datetime.strptime(line.split()[2] + " " + line.split()[3], "%m/%d/%Y %H:%M:%S")

---

您向t2提供了错误的输入。从文件中分割输入后，将变成此

['06/21/2019'，'21:45:24'，'06/21/2020'，'21:45:26']

t1应该得到输入0和1，t2应该得到输入2和3

更新代码如下：

import dateutil.relativedelta, datetime

f = open("data", "r")
for line in f:
    t1 = datetime.datetime.strptime(line.split()[0] + " " + line.split()[1], "%m/%d/%Y %H:%M:%S")
    t2 = datetime.datetime.strptime(line.split()[2] + " " + line.split()[3], "%m/%d/%Y %H:%M:%S")
    rd = dateutil.relativedelta.relativedelta(t1, t2)
    print(t1, t2, rd.seconds)