python学习之给小学生数学运算题（混合加减乘除法）

python代码随机生成加减乘除混合运算题，给熊孩子练习很不错哦！！！
寒假在家不能让他闲着，熊孩子的计算能力一如既往的差，学渣老爹继续根据学习进度自动生成寒假作业。不多说了，直接上代码，本着能用就好的原则，并没有调优，也没有把对应功能抽成函数。

代码：（没有过滤九九乘法表规则，有点乱）

import random
#定义多个变量并赋值
exp1,exp2 = "",""
str1,str2 = "",""
j=0
count=int(input("请输入出题数量："))
while j<count:if j<count:                              # 随机产生"+"或 "-"号 或"*"号 或"/"号flag = random.choice(["+", "-", "*", "/"])   # 随机产生"+"或 "-"号 或"*"号 或"/"号if flag == "+":a = random.randint(0, 100)b = random.randint(0, 100-a)result=a+b# 如果是减法，被减数和减数都应小于100elif flag == "-":a = random.randint(1, 100)b = random.randint(1, 100)# ab比较，较大的数为被减数if a < b:a,b=b,aresult=a-belif flag == "*":a = random.randint(1, 100)b = random.randint(1, 100)result=a*belif flag == "/":a = random.randint(1, 100)b = random.randint(1, 100)if a < b:a,b=b,aresult=int(a/b)a = str(a).ljust(2, " ")       # ljust左对齐b = str(b).ljust(2, " ")exp1 = a +" "+ flag +" "+ b + " ="exp2 = a +" "+flag +" "+ b + " ="+str(result)if j%2==0:                       #  j为偶数，不换行str1 = str1 + exp1 + '\t'str2 = str2 + exp2 + '\t'        else:                              #  j为奇数，换行str1 = str1 + exp1 + '\n'str2 = str2 + exp2 + '\n'j=j+1
with open('math.txt','w') as f:f.write(str1)
with open('key.txt','w') as f:f.write(str2)
print(count,"道混合加减乘除法题：")
print(str1)
print(count,"道混合加减乘除法题（带答案）：")
print(str2)

运行截图：

在新浪博客找到了一个比较好的代码，可参考：
注：如果是加号，保证两个数都不超过50，目前学的都是100以内的数；
如果是除号，保证在乘法口诀范围内即可。
代码实现：

import random
string = ""for day in range(1, 31):string = ""string = string + "\n快乐寒假第 " + str(day) + "　天：\n（１）快速口算\n"#用来记录每行算术题的个数num = 0#生成每天２０道加减乘除for i in range(1, 13):flag = random.choice([" + ", " － ", " × ", " ÷ "])exp = ""# 如果是加号，保证两个数都不超过50，目前学的都是100以内的数if flag == " + ":a = str(random.randint(1, 50)).ljust(2, " ")b = str(random.randint(1, 50)).ljust(2, " ")exp = a + flag + b# 如果是减号，保证被减数和减数都小于等于100即可if flag == " － ":a = random.randint(1, 100)b = random.randint(1, 100)# 保证较大的数作为被减数if a < b:tmp = aa = bb = tmpa = str(a).ljust(2, " ")b = str(b).ljust(2, " ")exp = a + flag + b# 如果是乘号，保证两个数都小于10即可if flag == " × ":a = str(random.randint(0, 9)).ljust(2, " ")b = str(random.randint(0, 9)).ljust(2, " ")exp = a + flag + b# 如果是除号，保证在乘法口诀范围内即可if flag == " ÷ ":a = random.choice([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, 28, 30, 32, 35, 36, 40,
42, 45, 48, 49, 54, 56, 63, 64, 72, 81])if a == 81:b = 9if a == 72:b = random.choice([1, 8, 9])if a == 64:b = 8if a == 63:b = random.choice([1, 7, 9])if a == 56:b = random.choice([1, 7, 8])if a == 54:b = random.choice([1, 6, 9])if a == 49:b = 7if a == 48:b = random.choice([1, 6, 8])if a == 45:b = random.choice([1, 5, 9])if a == 42:b = random.choice([1, 6, 7])if a == 40:b = random.choice([1, 5, 8])if a == 36:b = random.choice([1, 4, 9])if a == 35:b = random.choice([1, 5, 7])if a == 32:b = random.choice([1, 4, 8])if a == 30:b = random.choice([1, 6, 5])if a == 28:b = random.choice([1, 4, 7])if a == 27:b = random.choice([1, 3, 9])if a == 25:b = random.choice([1, 5])if a == 24:b = random.choice([1, 3, 4, 6, 8])if a == 21:b = random.choice([1, 3, 7])if a == 20:b = random.choice([1, 4, 5])if a == 18:b = random.choice([1, 2, 3, 6, 9])if a == 16:b = random.choice([1, 2, 4, 8])if a == 15:b = random.choice([1, 3, 5])if a == 14:b = random.choice([1, 2, 7])if a == 12:b = random.choice([1, 2, 3, 4, 6])if a == 10:b = random.choice([1, 2, 5])if a == 9:b = random.choice([1, 3, 9])if a == 8:b = random.choice([1, 2, 4, 8])if a == 7:b = random.choice([1, 7])if a == 6:b = random.choice([1, 2, 3, 6])if a == 5:b = random.choice([1, 5])if a == 4:b = random.choice([1, 2, 4])if a == 3:b = random.choice([1, 3])if a == 2:b = random.choice([1, 2])if a == 1:b = 1if a == 0:b = random.randint(1, 9)a = str(a).ljust(2, " ")b = str(b).ljust(2, " ")exp = a + flag + bif num < 3:string = string + exp + " =".ljust(7, " ")num = num + 1# 达到4个题目，换行else:string = string + exp + "=\n"num = 0string = string + "（２）提高口算\n"###用来生成两个运算符的算式# 用来记录每行算术题的个数num = 0for i in range(1, 7):result = 0flag = random.choice([" + ", " － ", " × ", " ÷ "])exp = ""# 如果是加号，保证两个数都不超过50，目前学的都是100以内的数if flag == " + ":a = str(random.randint(1, 50)).ljust(2, " ")b = str(random.randint(1, 50)).ljust(2, " ")exp = a + flag + bresult = int(a) + int(b)# 如果是减号，保证被减数和减数都小于等于100即可if flag == " － ":a = random.randint(1, 100)b = random.randint(1, 100)# 保证较大的数作为被减数if a < b:tmp = aa = bb = tmpa = str(a).ljust(2, " ")b = str(b).ljust(2, " ")exp = a + flag + bresult = int(a) - int(b)# 如果是乘号，保证两个数都小于10即可if flag == " × ":a = str(random.randint(0, 9)).ljust(2, " ")b = str(random.randint(0, 9)).ljust(2, " ")exp = a + flag + bresult = int(a) * int(b)# 如果是除号，保证在乘法口诀范围内即可if flag == " ÷ ":a = random.choice([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, 28, 30, 32, 35, 36, 40,
42, 45, 48, 49, 54, 56, 63, 64, 72, 81])if a == 81:b = 9if a == 72:b = random.choice([1, 8, 9])if a == 64:b = 8if a == 63:b = random.choice([1, 7, 9])if a == 56:b = random.choice([1, 7, 8])if a == 54:b = random.choice([1, 6, 9])if a == 49:b = 7if a == 48:b = random.choice([1, 6, 8])if a == 45:b = random.choice([1, 5, 9])if a == 42:b = random.choice([1, 6, 7])if a == 40:b = random.choice([1, 5, 8])if a == 36:b = random.choice([1, 4, 9])if a == 35:b = random.choice([1, 5, 7])if a == 32:b = random.choice([1, 4, 8])if a == 30:b = random.choice([1, 6, 5])if a == 28:b = random.choice([1, 4, 7])if a == 27:b = random.choice([1, 3, 9])if a == 25:b = random.choice([1, 5])if a == 24:b = random.choice([1, 3, 4, 6, 8])if a == 21:b = random.choice([1, 3, 7])if a == 20:b = random.choice([1, 4, 5])if a == 18:b = random.choice([1, 2, 3, 6, 9])if a == 16:b = random.choice([1, 2, 4, 8])if a == 15:b = random.choice([1, 3, 5])if a == 14:b = random.choice([1, 2, 7])if a == 12:b = random.choice([1, 2, 3, 4, 6])if a == 10:b = random.choice([1, 2, 5])if a == 9:b = random.choice([1, 3, 9])if a == 8:b = random.choice([1, 2, 4, 8])if a == 7:b = random.choice([1, 7])if a == 6:b = random.choice([1, 2, 3, 6])if a == 5:b = random.choice([1, 5])if a == 4:b = random.choice([1, 2, 4])if a == 3:b = random.choice([1, 3])if a == 2:b = random.choice([1, 2])if a == 1:b = 1if a == 0:b = random.randint(1, 9)a = str(a).ljust(2, " ")b = str(b).ljust(2, " ")exp = a + flag + bresult = int(a) / int(b)flag = random.choice([" + ", " － "])# 如果是加号，保证和不超过１００，目前学的都是100以内的数if flag == " + ":a = str(random.randint(1, 100 - result)).ljust(2, " ")exp = exp + flag + a# 如果是减号，保证能够减得着即可if flag == " － ":a = str(random.randint(0, result)).ljust(2, " ")exp = exp + flag + aif num < 2:string = string + exp + " =".ljust(7, " ")num = num + 1# 达到3个题目，换行else:string = string + exp + "=\n"num = 0string = string + "（３）竖式计算\n"###用来生成需要运用竖式运算的题目# 用来记录每行算术题的个数num = 0for i in range(1, 4):result = 0flag = random.choice([" + ", " － "])exp = ""# 如果是加号，保证两个数都不超过50，目前学的都是100以内的数if flag == " + ":a = str(random.randint(1, 50)).ljust(2, " ")b = str(random.randint(1, 50)).ljust(2, " ")exp = a + flag + bresult = int(a) + int(b)# 如果是减号，保证被减数和减数都小于等于100即可if flag == " － ":a = random.randint(1, 100)b = random.randint(1, 100)# 保证较大的数作为被减数if a < b:tmp = aa = bb = tmpa = str(a).ljust(2, " ")b = str(b).ljust(2, " ")exp = a + flag + bresult = int(a) - int(b)flag = random.choice([" + ", " － "])# 如果是加号，保证和不超过１００，目前学的都是100以内的数if flag == " + ":a = str(random.randint(1, 100 - result)).ljust(2, " ")exp = exp + flag + a# 如果是减号，保证能够减的着即可if flag == " － ":a = str(random.randint(0, result)).ljust(2, " ")exp = exp + flag + aif num < 2:string = string + exp + " =".ljust(7, " ")num = num + 1# 达到3个题目，换行else:string = string + exp + "=\n\n\n\n\n"num = 0print(string)

运行结果：

参考地址：https://blog.sina.com.cn/s/blog_6e22d8fb0102zif3.html，代码格式不对，谨慎参考。

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