如何在python中正确使用“或”？ [复制]

Question

我正在尝试将变量 numberOfDays 设置为等于该月的天数。但是，elif 语句有一个缺陷。我显然没有正确使用“或”语句，因为当我输入任何内容时，它总是说 numberOfDays 等于 30。

   monthSelection = input("Enter the month you wish to view: ")

   if monthSelection == "February":
        numberOfDays = 28
   elif monthSelection == "April" or "June" or "September" or "November":
        numberOfDays = 30
   else:
        numberOfDays = 31

有没有办法重新格式化这段代码以使其正常工作？

Answer 1

使用in 而不是or：

if monthSelection == "February":
    numberOfDays = 28
elif monthSelection in ("April", "June", "September", "November"):
    numberOfDays = 30
else:
    numberOfDays = 31

否则，您需要分别指定每个相等性：

if monthSelection == "February":
    numberOfDays = 28
elif monthSelection == "April" or monthSelection == "June" or monthSelection == "September" or monthSelection == "November":
    numberOfDays = 30
else:
    numberOfDays = 31