Python的新功能需要有关IF语句的一些指导

Question

Q：代码运行，但仅输出else语句...    任何帮助表示赞赏。

fruit = str()
favorite_fruits = ["mango", "kiwi", "pineapple"]
if fruit in favorite_fruits is "mango":
    print('You really like ' + fruit + '.')
if fruit in favorite_fruits is "kiwi":
    print('You really like ' + fruit + '.')
if fruit in favorite_fruits is "pineapple":
    print('You really like ' + fruit + '.')
if fruit in favorite_fruits is "apple":
    print('You really like' + fruit + '.')
else:
    print('Your going to starve.')

Answer 1

str()每次返回''。因此，fruit始终是''，不满足任何if语句。

您的if语句也已关闭。您可以只检查fruit中是否包含favorite_fruits，然后打印：

fruit = "mango"
favorite_fruits = ["mango", "kiwi", "pineapple"]

if fruit in favorite_fruits:
    print('You really like ' + fruit + '.')
else:
    print('Your going to starve.')

如果要用户输入，请使用input而不是硬编码fruit。