如何在Python中查找两个日期之间的工作日数？

Question

我有两个日期作为datetime.date对象，查找这两个日期之间的工作日数（包括开始日期和排除结束日期）的最 Pythonic 方法是什么？例如：

from datetime import date, timedelta

d1 = date(2019, 3, 1)
d2 = date(2019, 5, 6)
# The difference between d2 and d1 is 46 workdays

我想到写一个循环：

workdays = 0
for i in range((d2 - d1).days):
    if (d1 + timedelta(days=i)).isoweekday() <= 5:
        workdays += 1

不过，我认为有一个更简单的方法可以解决这个问题。

Answer 1

使用numpy函数busday_count：

from datetime import date
import numpy as np

d1 = date(2019, 3, 1)
d2 = date(2019, 5, 6)

days = np.busday_count( d1, d2 )
print (days)

或者

from datetime import date,timedelta
d1 = date(2019, 3, 1)
d2 = date(2019, 5, 6)
daygenerator = (d1 + timedelta(x + 1) for x in range((d2 - d1).days)) # generate all days from d1 to d2
print (sum(1 for day in daygenerator if day.weekday() < 5))