Python学习日志 - 5.if语句（习题解答）

最新推荐文章于 2025-06-03 21:49:37 发布

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最新推荐文章于 2025-06-03 21:49:37 发布

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分类专栏： Python学习日志

本文链接：https://blog.youkuaiyun.com/gtbl2012/article/details/79686625

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本文通过多个示例展示了Python中条件语句的使用方法，包括不同颜色外星人的得分规则、年龄判断、检查水果偏好等，帮助读者理解if-elif-else结构的应用。

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# 5-3
alien_color = "green"
if alien_color == "green":
    print("You got 5 point")

alien_color = "red"
if alien_color == "green":
    print("You got 5 point")

#5-4
alien_color = "red"
if alien_color == "green":
    print("You got 5 point")
else:
    print("You got 10 point")

alien_color = "green"
if alien_color == "green":
    print("You got 5 point")
else:
    print("You got 10 point")

#5-5
alien_color = "green"
if alien_color == "green":
    print("You got 5 point")
elif alien_color = "yellow":
    print("You got 10 point")
elif alien_color = "red":
    print("You got 15 point")

alien_color = "red"
if alien_color == "green":
    print("You got 5 point")
elif alien_color = "yellow":
    print("You got 10 point")
elif alien_color = "red":
    print("You got 15 point")

alien_color = "yellow"
if alien_color == "green":
    print("You got 5 point")
elif alien_color = "yellow":
    print("You got 10 point")
elif alien_color = "red":
    print("You got 15 point")

#5-6
age = 19
if age < 2:
    print("He is a baby")
elif age < 4:
    print("He is learning to walk")
elif age < 13:
    print("He is a child")
elif age < 20:
    print("He is a teenager")
elif age < 65:
    print("He is an adult")
else:
    print("He is a old man")

#5-7
favorite_fruits = ["apples", "bananas", "oranges"]
if "apples" in favorite_fruits:
    print("you really like apples")
if "bananas" in favorite_fruits:
    print("you really like bananas")
if "oranges" in favorite_fruits:
    print("you really like oranges")
if "mellons" in favorite_fruits:
    print("you really like mellons")
if "pears" in favorite_fruits:
    print("you really like pears")

#5-8
usernames = ["admin", "bob", "alice", "david", "john"]
for user in usernames:
    if user == "admin":
        print("Hello {}, would you like to see a status report?".format(user))
    else
        print("Hello {}, thank you for logging in again".format(user))

#5-9
usernames = ["admin", "bob", "alice", "david", "john"]
usernames = []
if len(usernames) == 0:
    print("We need to find some users!")
for user in usernames:
    if user == "admin":
        print("Hello {}, would you like to see a status report?".format(user))
    else
        print("Hello {}, thank you for logging in again".format(user))

#5-10
current_users = ["admin", "bob", "alice", "david", "john"]
new_users = ["bob", "john", "cindy", "daicy", "bill"]
for new_user in new_users:
    if new_user in current_users:
        print("Username {} is already exist, please change another one.".format(new_user))
    else:
        print("This username is valid")