python编程：从入门到实践----基础知识>第4章练习

pizza = ["Zunbao","Bishengke","Bipizza"]
for i in pizza:
    print(i)
    print("I like pepperoni pizza\n")
print("I really love pizza")

　　

4-2 动物：想出至少三种有共同特征的动物，将这些动物的名称存储在一个列表中，再使用for 循环将每种动物的名称都打印出来。
a.修改这个程序，使其针对每种动物都打印一个句子，如“Adogwould makea great pet”。
b.在程序末尾添加一行代码，指出这些动物的共同之处，如打印诸如“Any oftheseanimals would makea great pet!”这样的句子。

animals = ["tiger","rabbit","panda"]
for i in animals:
    print(i)
    print("A dog would make a great pet\n")
print("Any of these animals would make a great pet!")

　　


4-3 数到20 ：使用一个for 循环打印数字1~20（含）。

for i in range(1,20+1):
    print(i)

millions = list(range(1,1000000))     #用list把数字转换成列表格式
for i in millions:
    print(i)

millions = list(range(1,1000000))
print(min(millions))
print(max(millions))
print(sum(millions))

　　

4-6 奇数 ：通过给函数range() 指定第三个参数来创建一个列表，其中包含1~20的奇数；再使用一个for 循环将这些数字都打印出来。

numbers= list(range(1,20,2))   #通过range的第三个参数，也就是步长为2，来获取奇数
for i in numbers:
    print(i)

numbers= list(range(3,30,3))
for i in numbers:
    print(i)

squares=[]
for value in range(1,10+1):
    square = value**3
    squares.append(square)
print(squares)

square=[value**3 for value in range(1,10+1)]
print(square)


4-10 切片：选择你在本章编写的一个程序，在末尾添加几行代码，以完成如下任务。
a. 打印消息“The first three items in the lis tare:”，再使用切片来打印列表的前三个元素。
b. 打印消息“Three items from the middle of the list are:”，再使用切片来打印列表中间的三个元素
c. 打印消息“The last three items in the list are:”，再使用切片来打印列表末尾的三个元素
my_foods = [‘pizza‘, ‘falafel‘, ‘carrot cake‘,‘fruit‘,‘coffee‘,‘rice‘,‘meat‘]
print("The first three items in the list are:")
print(my_foods[:3])
print("\nThree items from the middle of the list are:")
print(my_foods[2:5])
print("\nThe last three items in the list are:")
print(my_foods[4:])

#输出结果：
The first three items in the list are:
[‘pizza‘, ‘falafel‘, ‘carrot cake‘]

Three items from the middle of the list are:
[‘carrot cake‘, ‘fruit‘, ‘coffee‘]

The last three items in the list are:
[‘coffee‘, ‘rice‘, ‘meat‘]

4-11 你的比萨和我的比萨 ：在你为完成练习4-1而编写的程序中，创建比萨列表的副本，并将其存储到变量friend_pizzas 中，再完成如下任务。
a. 在原来的比萨列表中添加一种比萨。
b. 在列表friend_pizzas 中添加另一种比萨。
c. 核实你有两个不同的列表。为此，打印消息“My favorite pizzasare:”，再使用一个for 循环来打印第一个列表；打印消息“My friend‘s favorite pizzasare:”，再使用一个for 循环来打印第二个列表。核实新增的比萨被添加到了正确的列表中。

pizza = ["Zunbao","Bishengke","Bipizza"]
friend_pizzas = pizza[:]
pizza.append("Niu")
friend_pizzas.append("Liang")

print("My favorite pizzasare:")
for i in pizza:
    print(i)

print("\nMy friend‘s favorite pizzasare:")
for j in friend_pizzas:
    print(j)
#输出结果：
My favorite pizzasare:
Zunbao
Bishengke
Bipizza
Niu

My friend‘s favorite pizzasare:
Zunbao
Bishengke
Bipizza
Liang

my_foods=[‘pizza‘,‘falafel‘,‘carrot‘,‘cake‘]
friend_foods = my_foods[:]
my_foods.append(‘cannoli‘)
friend_foods.append(‘ice cream‘)
print("My favorite foods are:")
for my_food in my_foods:
    print(my_food)
print("\nMy friend‘s favorite foods are:")
for friend_food in friend_foods:
    print(friend_food)

#输出结果：
My favorite foods are:
pizza
falafel
carrot
cake
cannoli

My friend‘s favorite foods are:
pizza
falafel
carrot
cake
ice cream

foods =(‘rice‘,‘meat‘,‘seafood‘,‘vegetable‘,‘fruit‘)
print("The original foods are:")
for food in foods:
    print(food)

#foods[0]=‘coffee‘
#print(foods[0])

foods=(‘coffee‘,‘meat‘,‘seafood‘,‘vegetable‘,‘tea‘)
print("\nThe modify foods are:")
for food in foods:
    print(food)

#输出结果：
The original foods are:
rice
meat
seafood
vegetable
fruit

The modify foods are:
coffee
meat
seafood
vegetable
tea