datetime - 导入错误: cannot import name 'strftime'

Question

我收到错误，不知道为什么，我的代码如下:

year1 = int(input('choose a year :',))
month1 = int(input('choose a month :',))
day1 = int(input('choose a day :',))
year2 = int(input('choose a year :',))
month2 = int(input('choose a month :',))
day2 = int(input('choose a day :',))
from datetime import date, timedelta as td
from datetime import strftime as st
d1 = date(year1, month1, day1)
d2 = date(year2, month2, day2)
delta = d2 - d1
for i in range(delta.days + 1):
day = st((d1 + td(days=i)))
print(get_exrates(day))    

我得到的完整错误代码是:

Traceback (most recent call last):
    line 17, in <module>
    from datetime import strftime as st
ImportError: cannot import name 'strftime'

Answer 1

如strftime是 datetime 类的实例方法，您需要先从 datetime 模块导入 datetime，然后使用其 strftime 方法:

>>> from datetime import datetime
>>> datetime.strftime
<method 'strftime' of 'datetime.date' objects>