python - Python循环不断返回错误，我该如何修改？

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Why non-equality check of one variable against many values always returns true?
                                
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sandwichType=""
totalCost=0
sandwiches=["Baguette", "Bagel", "Sub", "Wrap", "White"]
sandwichVAL={"Baguette":3.50, "Bagel":2.10, "Sub":3.99, "Wrap":4.15, "White":0.90}
choice=""
while choice!="Baguette" or choice!="Bagel" or choice!="Sub" or choice!="Wrap" or choice!="White":
  choice=str(input("What type of sandwich would you like?\n>Baguette - £3.50\n>Bagel    - £2.10\n>Sub      - £3.99\n>Wrap     - £4.15\n>White    - £0.90\n"))
  if choice!="Baguette" or choice!="Bagel" or choice!="Sub" or choice!="Wrap" or choice!="White":
    print("Unfortunately, that is not a valid choice! Please pick again and remember to capitalise the first letter!")
  else:
    print()
totalCost+=sandwichVAL[choice]
print(totalCost)

此代码不断返回

Unfortunately, that is not a valid choice! Please pick again and remember to capitalise the first letter!

即使选择变量正确。我应该进行哪些编辑才能打印总成本？

最佳答案

看一下你的逻辑：

if choice != A or choice != B ...

choice只能与您的一种硬编码替代项匹配；对于任何True值，此测试必须为choice。
相反，尝试类似

if choice not in ["Baguette", "Bagel", "Sub", ...]:

更好的是，使用您已有的列表：

if choice not in sandwiches:

关于python - Python循环不断返回错误，我该如何修改？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/48310130/