python 从入门到实践第五章习题（高级编程技巧 week3-1）

比眉伴天荒 2022-05-29 09:24 166阅读 0赞

# python 从入门到实践 第五章习题 （高级编程技巧 week3-1） #

## 5.1 ##

这里主要就讲了一些条件语句的判断条件。  
其中我们以前可能没有接触过的就是这样的语句：检测某特定值是否在列表中。  
这里有个新的关键词：in

### 5-2 ###

print('abc' == 'abc')
    
    if "aBc".lower() == "abc":
        print("True")
    
    if 4 != 4:
        print("Not equal")
    else:
        print("Equal")
    
    
    l = range(1,11)
    print(1 in l)
    print(11 in l)
    
    print(1 in l and 2 in l) # return True
    print(1 in l or 11 in l) # return True

## 5.3 if语句 ##

基本的格式：

if conditional_test:
        dodododo
    else:
        dodododo

当然还有另外一种结构：

if comditional_test:
        dodododo
    elif comditional_test2:
        dodododo
    elif conditional_test3:
        dodododo
    else:
        dodododo

### 5-4 ###

alien_color = "green"
    if alien_color == "green":
        print("You shoot a green alien! You got five points")
    else:
        print("You got ten points!")

### 5-6 人生的不同阶段 ###

age = 20
    if age < 2:
        print("He is a baby.")
    elif 2 <= age and age < 4:
        print("He is learning walking.")
    elif 4 <= age and age < 13:
        print("He is a child.")
    elif 13 <= age and age < 20:
        print("He is a teenager.")
    elif 20 <= age and age < 65:
        print("He is an adult.")
    else:
        print("He is an old man.")

### 5-7 喜欢的水果 ###

favorite_fruits = ["apple", "orange", "banana"]
    if "apple" in favorite_fruits:
        print("You really like apples." )
    elif "orange" in favorite_fruits:
        print("You really like oranges." )
    elif "banana" in favorite_fruits:
        print("You really like bananas." )
    elif "pear" in favorite_fruits:
        print("You really like pears.")
    elif "blueberry" in favorite_fruits:
        print("You really like bluebarries.")

## 5.4 使用if语句处理列表 ##

### 5-8 / 5-9 ###

users = ["admin", "John", "Mike", "Amy", "Lily"]
    if users:
        for name in users:
            if name == "admin":
                print("Hello admin, would you like to see a status report?")
            else :
                print("Hello ", name, ", thank you for logging in again")
    else:
        print("We need to find some users!")

### 5-10 ###

current_users = ["John", "Mike", "Amy", "Lily","Yaron"]
    new_users = ["John", "Walker", "Mike", "Kuly", "Amy"]
    for user in new_users:
        if user.title() in current_users:
            print("please use another username")
        else:
            print("This user name haven't been used!")