前言：假期中，许多小学老师要求每天要给学生出一定数量的题目，供学生练习，然后给学生检查，十分麻烦。
import random# 用来计算最终结果
def calculation_formula(a,b,c,c1,c2):if c1 == '+':num = a+belse:num = a-bif c2 == '+':num = num+celse :num = num-creturn numdef random_formula():a = random.randint(0, 100)b = random.randint(0, 100)c = random.randint(0, 100)op = ['+', '-']c1 = random.choice(op)c2 = random.choice(op)# 生成式子formula = str(a) + c1 + str(b) + c2 + str(c)re = calculation_formula(a,b,c,c1,c2)string = formula+'='+str(re)# 防止出现负数if re < 0:random_formula()else:# print(formula,'=',re)# 将生成的算式写到文件中去with open(r'C:\Users\lch20\Desktop\math\01.txt','a',encoding='utf-8') as f:f.write(string)# 为了美观f.write('\n')pass# 生成25个100以内的加减混合运算
for i in range(25):random_formula()pass