python第四章课后题答案4.7_《Python编程》第四章部分课后练习题

#4-3 数到20:

代码:#4-3 数到20

for num in range(1, 21):

print(num)

输出:pass

#4-5 计算1~1 000 000的总和:

代码:#4-5 计算1~1 000 000的总和

import time

nums = list(range(1, 1000001))

print(min(nums))

print(max(nums))

time1 = time.clock()

print(sum(nums))

time2 = time.clock()

message = 'It costs ' + str(time2 - time1) + 's'

print (message)

输出:1

1000000

500000500000

It costs 0.1980368107604632s

#4-6 奇数:

代码:#4-6 奇数

nums = list(range(1, 20, 2))

for num in nums:

print(num)

输出:pass

#4-7 3的倍数:

代码:#4-7 3的倍数

nums = list(i*3 for i in range(1, 11))

for num in nums:

print(num)

输出:pass

#4-8 立方:

代码:#4-8 立方

nums = list(i**3 for i in range(1, 11))

for num in nums:

print(num)

输出:pass

#4-9 立方解析:

代码:#4-9 立方解析

nums = list(i**3 for i in range(1, 11))

print(num)

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

#4-10 切片:#4-10 切片

nums = list(i**3 for i in range(1, 11))

print(nums)

message = '\nThe first three items in the list are:'

print(message)

print(nums[:3])

message = '\nThree items from the middle of the list are:'

print(message)

print(nums[3:6])

message = '\nThe last three items in the list are:'

print(message)

print(nums[-3:])

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

The first three items in the list are:

[1, 8, 27]

Three items from the middle of the list are:

[64, 125, 216]

The last three items in the list are:

[512, 729, 1000]

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