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100
elif 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,a
result=a-b
elif flag == "*":
a = random.randint(1, 100)
b = random.randint(1, 100)
result=a*b
elif flag == "/":
a = random.randint(1, 100)
b = random.randint(1, 100)
if a < b:
a,b=b,a
result=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 = a
a = b
b = tmp
a = 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 = 9
if a == 72:
b = random.choice([1, 8, 9])
if a == 64:
b = 8
if 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 = 7
if 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 = 1
if a == 0:
b = random.randint(1, 9)
a = str(a).ljust(2, " ")
b = str(b).ljust(2, " ")
exp = a + flag + b
if num < 3:
string = string + exp + " =".ljust(7, " ")
num = num + 1
# 达到4个题目，换行
else:
string = string + exp + "=\n"
num = 0
string = 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 = 0
for i in range(1, 7):
result = 0
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
result = 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 = a
a = b
b = tmp
a = str(a).ljust(2, " ")
b = str(b).ljust(2, " ")
exp = a + flag + b
result = 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 + b
result = 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 = 9
if a == 72:
b = random.choice([1, 8, 9])
if a == 64:
b = 8
if 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 = 7
if 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 = 1
if a == 0:
b = random.randint(1, 9)
a = str(a).ljust(2, " ")
b = str(b).ljust(2, " ")
exp = a + flag + b
result = 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 + a
if num < 2:
string = string + exp + " =".ljust(7, " ")
num = num + 1
# 达到3个题目，换行
else:
string = string + exp + "=\n"
num = 0
string = 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 = 0
for i in range(1, 4):
result = 0
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
result = 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 = a
a = b
b = tmp
a = str(a).ljust(2, " ")
b = str(b).ljust(2, " ")
exp = a + flag + b
result = 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 + a
if 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 = 0
print(string)运行结果：
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