代码：

`import random

四则运算

def szys():

sym = [‘＋‘, ‘－‘, ‘ב, ‘÷‘]

f = random.randint(0, 3)

n1 = random.randint(1, 20)

n2 = random.randint(1, 20)

result = 0

if f == 0:  # 加法

   result = n1 + n2

elif f == 1:  # 减法，要先比较大小，防止输出负数

    n1, n2 = max(n1, n2), min(n1, n2)

    result = n1 - n2

elif f == 2:  # 乘法

    result = n1 * n2

elif f == 3:  # 除法，要比较大小，并循环取整除

    n1, n2 = max(n1, n2), min(n1, n2)

    while n1 % n2 != 0:

        n1 = random.randint(1, 10)

        n2 = random.randint(1, 10)

        n1, n2 = max(n1, n2), min(n1, n2)

    result = int(n1 / n2)

print(n1, sym[f], n2, ‘= ‘, end=‘‘)

return result

制作题库

def test():

sym = [‘＋‘, ‘－‘, ‘ב, ‘÷‘]

print(‘输入所需要的题目数量‘)

n = int(input())

result = []

m = 0

while m <= (n-1):

    print(m+1, end=‘、‘)

    result .append(szys())

    print(‘ ‘)

    m = m+1

m = 0

print(‘对应的答案：‘)

while m <= (n-1):

    print(m+1, ‘、‘, result[m])

    m = m+1

print(‘选择想要的模式‘)

print(‘1、进行四则运算‘)

print(‘2、制作题库‘)

n = int(input())

当输入1时，进行四则运算，调用函数syzs()

if n == 1:

while True:

    result = szys()

    j = input()

    s = int(j)

    if s == result:

        print(‘right‘)

    else:

        print(‘error.，the answer is‘, result)

当输入2时，进行制作题库

if n == 2:

test()`

参考链接：> https://www.cnblogs.com/zhouxiaochun/p/10567992.html

四则运算

原文：https://www.cnblogs.com/1482156703optimus/p/14055489.html