编写一个程序用来计算两个日期之间相差的天数。

import datetime def days_between(d1, d2): d1 = datetime.datetime.strptime(d1, "%Y-%m-%d") d2 = datetime.datetime.strptime(d2, "%Y-%m-%d") return abs((d2 - d1).days) # Driver program date_1 = "2019-05-01" #Input date 1 in YYYY-MM-DD format date_2 = "2019-06-15" #Input date 2 in YYYY-MM-DD format print("There are {} days in between {} and {}".format(days_between(date_1, date_2),date_1,date_2))