Python编程三剑客学习之路

从练习4-11开始。

第四章

练习4-11：

pizzas = ['黄瓜','茄子','西红柿']
friend_pizzas = pizzas[:]
pizzas.append('白菜')
friend_pizzas.append('辣椒')
print(f"My favorite pizzas are:{pizzas}")
print(f"My friend's favorite pizzas are:{friend_pizzas}")
for pizza in pizzas:
    print(pizza)
print("\n")
for friend_pizza in friend_pizzas:
    print(friend_pizza)

练习4-12：

略

练习4-13：

foods = ('饺子','面条','油条','包子','豆浆')
for food in foods:
    print(food)

print('\n')

foods = ('牛肉','羊肉','油条','包子','豆浆')
for food in foods:
    print(food)

练习4-14：略

练习4-15：略

第五章

练习5-1

car = 'subaru'
print("Is car == 'subaru'? I predict True.")
print(car == 'subaru')

print("\nIs car == 'audi'? I predict False.")
print(car == 'audi')

练习5-2 略

练习5-3

alien_color = "green"
if alien_color == "green":
    print("获得5分")
if alien_color == "yellow":
    print("获得10分")

练习5-4

alien_color = "green"
if alien_color == "green":
    print("获得5分")
else:
    print("获得10分")

练习5-5

alien_color = "green"
if alien_color == "green":
    print("获得5分")
elif alien_color == "yellow":
    print("获得10分")
else:
    print("获得15分")

alien_color = "yellow"
if alien_color == "green":
    print("获得5分")
elif alien_color == "yellow":
    print("获得10分")
else:
    print("获得15分")

alien_color = "red"
if alien_color == "green":
    print("获得5分")
elif alien_color == "yellow":
    print("获得10分")
else:
    print("获得15分")

练习5-6

age = 21
if age < 2:
    print("这个人是婴儿。")
elif age >=2 and age < 4:
    print("这个人是幼儿。")
elif age >= 4 and age < 13:
    print("这个人是儿童。")
elif age >= 13 and age < 20:
    print("这个人是青少年。")
elif age >= 20 and age < 65:
    print("这个人是成年人。")
else:
    print("这个人是老年人。")

练习5-7

favorite_fruits = ['苹果','香蕉','梨']
if '桃' in favorite_fruits:
    print(f"You really like 桃!")
if '苹果' in favorite_fruits:
    print(f"You really like 苹果!")
if '草莓' in favorite_fruits:
    print(f"You really like 草莓!")
if '香蕉' in favorite_fruits:
    print(f"You really like 香蕉!")
if '梨' in favorite_fruits:
    print(f"You really like 梨!")

练习5-8

users = ['admin','小刘','小张','小王','小李']
for user in users:
    if user == 'admin':
        print(f"Hello {user}, would you like to see a status report?")
    else:
        print(f"Hello {user}, thank you for logging in again.")

练习5-9

users = []
if users: 
    for user in users:
        if user == 'admin':
            print(f"Hello {user}, would you like to see a status report?")
        else:
            print(f"Hello {user}, thank you for logging in again.")
else:
    print("We need to find some users!")

练习5-10

current_users = ['Liu','Yang','Wang','Zhang','Ma']
new_users = ['Liu','Yang','Li','Gong','Zhao']
b_current_users =[]
for current_user in current_users:
    b_current_users.append(current_user.lower()) 
for new_user in new_users:
    if new_user.lower() in b_current_users:
        print("已被使用。")
    else:
        print("未被使用。")

练习5-11

digits = list(range(1,10))
for digit in digits:
    if digit == 1:
        print(f"{digit}st")
    elif digit == 2:
        print(f"{digit}nd")
    elif digit == 3:
        print(f"{digit}rd")
    else:
        print(f"{digit}th")

练习5-12 略

练习5-13 略