if else
weather = input("What is the weather? ").lower()if weather == "sunny":
print("Time to ride a crocodile!")
if weather == "rainy":
print("Rainy dance time!")
if weather == "tornado":
print("Tornado party!")
else:
print("Watch TV!")
如果我输入sunny，为什么输出的是
Time to ride a crocodile！
Watch TV!
当他判定是sunny以后这个不就结束了吗？ 你没理解if...elif...elif...else的意思
weather = input("What is the weather? ").lower()
if weather == "sunny":
print("Time to ride a crocodile!")
elif weather == "rainy":
print("Rainy dance time!")
elif weather == "tornado":
print("Tornado party!")
else:
print("Watch TV!") 你这样写，相当于分成了三个判断
weather = input("What is the weather? ").lower()
if weather == "sunny":
print("Time to ride a crocodile!")
if weather == "rainy":
print("Rainy dance time!")
if weather == "tornado":
print("Tornado party!")
else:
print("Watch TV!") 本帖最后由 sunrise085 于 2020-9-13 18:08 编辑
你写的是多个if，但是你想要的应该是 if …elif…elif…else…
多个if会都进行判断，可能会进入多个分支；但是 if …elif…elif…else…进行判断只进入一个分支
weather = input("What is the weather? ").lower()
if weather == "sunny":
print("Time to ride a crocodile!")
elif weather == "rainy":
print("Rainy dance time!")
elif weather == "tornado":
print("Tornado party!")
else:
print("Watch TV!") Python自动把else和turnado的if配对了，你没有输入turnado，所以就打印Watch TV了
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