仅显示用于输入 yes 的消息，无论您输入什么

Question

当我运行此代码时，无论我输入什么，它总是显示为"我同意！任何帮助不胜感激！

Pizza_opinion = input("Does pizza taste good? ")
if Pizza_opinion == "Yes" or "yes":
    print("I agree! ")
elif Pizza_opinion == "No" or "no":
    print ("I disagree...?")

Answer 1

您假设条件检查Pizza_opinion是否等于"是"或等于"是"，但它真正做的是检查Pizza_opinion是否等于"是"或字符串文字"是"是否为真，它总是如此。elif 条件也有同样的问题。

解决方案是重复使用"是"执行的相等性检查：

if Pizza_opinion == "Yes" or Pizza_opinion == "yes":

Answer 2

你没有正确使用条件 - 你不能使用这样的or(你可以，但它没有按照你的意思(。你基本上告诉了 Python if Pizza_opinion equals "Yes", or if "yes" evaluates to True (and it does) then print "I agree " .使用以下任一方式：

if Pizza_opinion == "Yes" or Pizza_opinion == "yes":
    print("I agree! ")
elif Pizza_opinion == "No" or Pizza_opinion == "no":
    print ("I disagree...?")

或：

if Pizza_opinion in ("Yes", "yes"):
    print("I agree! ")
elif Pizza_opinion in ("No", "no"):
    print ("I disagree...?")

或者简单地说：

if Pizza_opinion.lower() == "yes":
    print("I agree! ")
elif Pizza_opinion.lower() == "no":
    print ("I disagree...?")