Python编程 从入门到实践 第四章 作业参考答案 （部分）_头歌实践教学平台答案pyhon第四章作业

4-2 动物

animals = ["dog","cat","panda","squirrel"]
for a in animals:
    print(a.title())
for a in animals:
    print("A",a,"could be so cute!")
 
print("Any of these could be a cute icon!")

Dog
Cat
Panda
Squirrel
A dog could be so cute!
A cat could be so cute!
A panda could be so cute!
A squirrel could be so cute!
Any of these could be a cute icon!

4-5 一百万

million = list(range(1,1000001))
print(min(million))
print(max(million))
print(sum(million))

1
1000000
500000500000

4-6 4-7 奇数 3的倍数

odds = list(range(1,21,2))
for odd in odds:
    print(odd)
 
print('---------')
times3 = list(range(3,31,3))
for t3 in times3:
    print(t3)

1
3
5
7
9
11
13
15
17
19
---------
3
6
9
12
15
18
21
24
27
30

4-9 列表解析

mylist = [num**3 for num in range(1,11)]
print(mylist)

[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000]

4-10 切片

animals = ["dog","cat","panda","squirrel"]
print("The first three items:",animals[:3])
print("Three items from the middle of the list are:",animals[1:4])
print("The last three items are:",animals[-3:])

The first three items: ['dog', 'cat', 'panda']
Three items from the middle of the list are: ['cat', 'panda', 'squirrel']
The last three items are: ['cat', 'panda', 'squirrel']

4-13 自助餐，略

（元组元素不能被修改）