while循环在python中有多个条件

Question

weatherType = raw_input('Enter a weather type: ')

while (weatherType != "WINDDIRECTION") or (weatherType != "WINDSPEED") or (weatherType != "AIRTEMPERATURE") or (weatherType != "WAVEHEIGHT") or (weatherType != "AIRPRESSURE"):
    print "Sorry, invalid input. Please enter AIRTEMPERATURE, AIRPRESSURE, WAVEHEIGHT, WINDSPEED, or WINDDIRECTION  for a city and either WINDDIRECTION, WINDSPEED, or AIRTEMPERATURE for an off shore bouy"
    weatherType = raw_input('Enter a weather type: ')

好了,所以用这个循环中,我试图让用户输入要么WINDDIRECTION,WINDSPEED,AIRTEMPERATURE,WAVEHEIGHT,或AIRPRESSURE.但是,即使用户输入这5个选项中的1个,我的代码仍然会进入while循环.我不知道发生了什么事.我知道我可以使用for循环(对于["WINDDIRECTION",....]中的x)但是for循环只能查看他们的输入是否是第一次是正确的,如果他们再输入错误的答案代码将继续

Answer 1

(x != y) or (x != z) ...

将始终是真实的.由于您使用的是Python,我建议您使用in:

if x in ['a', 'b', 'c']: