书后习题答案：《Python程序设计基础（第2版）》，电子工业出版社，2020.01

【持续更新】

第 2 章

一、选择题

1. B
2. B
3. B
4. BD
5. AD
6. C
7. A B
8. C
9. D
10. AC
11. D

二、填空题

1. ‘#’
2. ‘\’
3. 整数（int）、浮点数（float）、布尔值（bool）、复数（complex）
4. n % 2 == 0 (或：not n % 2)

第 3 章

from math import *

x1 = float(input("请输入x1: "))
# print(x1)
x2 = float(input("请输入x2: "))
y1 = float(input("请输入y1: "))
y2 = float(input("请输入y2: "))

dis = sqrt(pow(x1 - x2, 2) + pow(y1 - y2, 2))
print("两点之间的距离：", dis)

from math import *
import random

x1 = random.randint(1, 10)  # 圆锥的半径
x2 = random.randint(1, 10)  # 圆锥的高

vol = pi * x1 * x1 * x2 / 3  # 圆锥的体积
print("圆锥的体积为：", vol)

第 4 章

一、单选题

1. D
2. B
3. B
4. D
5. ACD
6. B
7. C

二、程序填充题

code = ('g', 'K', 'a', 'P', 'W', 'x', 'E', 'Q', 'f', 't')
while True:
    d = ''
    s = input("Please Input the Ciphertext('q' for Exit): \n")
    if s == 'q':
        break
    for i in range(len(s)):
        if s[i] in code:
            p = code.index(s[i])
            d += str(p)
        else:
            d += '?'
    print("The Plaintext is:\n" + d)

三、程序设计题

def get_code(c_num_15):
    sum = 0
    for i in [0, 2, 4, 6, 8, 10, 12, 14]:
        mul = c_num_15[i] * 2
        sum += mul % 10  # 乘积的个位数
        sum += mul // 10  # 乘积的十位数

    # print(sum)
    for i in [1, 3, 5, 7, 9, 11, 13]:
        sum += c_num_15[i]

    # print(sum)

    dig = sum % 10
    if dig == 0:
        code = 0
    else:
        code = 10 - dig

    return code

"""
例程：检验卡号合法性
"""

import numpy
from Q3 import get_code

c_num_16 = numpy.zeros(16)
# print(c_num_15)
print("请输入完整卡号（16位）：")
for i in range(16):
    c_num_16[i] = int(input())

print("请再次确认卡号：")
print(c_num_16)

c_num_15 = c_num_16[:15]  # 切片，取前15位
# print(c_num_15)

code = get_code(c_num_15)
if code == c_num_16[15]:
    print("卡号合法")
else:
    print("卡号不合法")

第 5 章

一、选择题

1. A
2. B
3. D
4. A

第 6 章

一、选择题

1. D
2. ?
3. D
4. A
5. D
6. B

二、程序填充题
1.

def func(x, y):
    """
    :param x:
    :param y:
    :return: x ^ y
    """
    s = 1
    for i in range(1, y + 1):
        s = s * x
    return s


# func(3, 4)  # 3 ^ 4 = 81
def main():
    while True:
        n = int(input("Please Input an Even Number(2-8, Press '0' for Exit):\n"))
        if n == 0:
            break
        if (2 <= n <= 8) and (n % 2 == 0):
            res = func(n + 1, n) - func(n, n - 1)
            print("The Result is:", str(res))
        else:
            print("Out of the Range")


if __name__ == '__main__':
    main()

import random


def redEnv(k, rest):
    m = random.random() * rest
    return m


total = float(input("请输入红包金额："))
num = int(input("请输入红包个数："))
remain = total

for i in range(num - 1):
    money = redEnv(i, remain)
    remain -= money
    print("红包%d: %.2f" % (i + 1, money))

print("红包%d: %.2f" % (num, remain))

def judge(passwd):
    result = 0
    n = len(passwd)
    if n >= 8:
        result += 1
    for i in range(n):
        if '0' <= passwd[i] <= '9':
            result += 1
            break
    for i in range(n):
        if 'A' <= passwd[i] <= 'Z':
            result += 1
            break
    for i in range(n):
        if 'a' <= passwd[i] <= 'z':
            result += 1
            break
    return result


while True:
    st = input("请输入测试密码（直接回车为退出）：\n")
    if st == "":
        break
    s = judge(st)
    print("%s的密码强度为%d级" % (st, s))

第 7 章

1. C
2. A
3. B
4. B
5. B
6. C
7. D
8. B