Spyder 4.1.4和python 3.8的正确验证循环

Question

所以我的代码是这样的：

def main(): 
print("Press '1' to start a new dice roll calculation") 
print("or press '0' to end the program") #escape key
validation = int(input()) #so the user can press enter
while validation != 1 or validation != 0: #input validation loop with escape key
print("Press ENTER to start a new dice roll calculation")
validation = int(input())

当我出于某种原因试图运行验证循环时，它会让我陷入一个无限循环，但当我检查我的教科书时(Tony Gaddis，2017(，它应该是正确的。我哪里错了？

Answer 1

它正在检查1或0是否不存在。如果键入1，则0不存在，反之亦然，因此它总是会导致错误。将or更改为and，如下所示：

def main(): 
print("Press '1' to start a new dice roll calculation") 
print("or press '0' to end the program") #escape key
validation = int(input()) #so the user can press enter
#input validation loop with escape key using AND instead of OR
while validation != 1 and validation != 0: 
print("Press ENTER to start a new dice roll calculation")
validation = int(input())