python - Python 中错误的 if-else 情况

Question

这个问题已经有答案了:

How to test multiple variables for equality against a single value? (31 个回答)

Why does "a == x or y or z" always evaluate to True? How can I compare "a" to all of those? (8 个回答)

已关闭 7 年前。

有人可以看看这个并告诉我出了什么问题吗？我尝试运行它，但是当你说 no 时下雨和 no对于下雪，它仍然打印出 if true 语句 You can't ride your bike

raining = input("Is it raining right now?\nYes or No?\n")
if raining.lower() == "yes" :
    raining = True
else:
    raining = False
snowing = input("Is it snowing out?\nYes or No\n")
if snowing.lower() == "yes" :
    snowing = True
else:
    snowing = False
if raining or snowing == True :
    print("You can't ride your bike")
if raining and snowing == False :
    print("You can ride your bike")

cost = input("How much is your new PC?")
cash = input("How much money do you have?")
total = float(cash) + float(cost)
if total < 0 :
    print("You can't buy it")
if total >= 0 :
    print ("You can buy it")

Answer 1

if raining and Snowing == False 解释为:

if raining == True and snowing == False

您应该按如下方式更新第二个 if 语句:

if raining == False and snowing == False:
    ...

由于 if raining 和 if raining == True 在检查 bool 值方面是相同的，因此您可以像这样简化逻辑:

if raining or snowing:
    print("You can't ride your bike")
else:
    # implies "not (raining or snowing)" or "(not raining) and (not snowing)"
    print("You can ride your bike")