一个整数的随机数学方程式

如何解决一个整数的随机数学方程式

我正在尝试做一些创建与预定义变量相等的随机算术方程的操作。例如：

sNum = 10
# Do something here
fNum = 3 * 2 - 3 + 7
fNum == sNum
True

我已经尝试过考虑如何做到这一点，但是还没有运气。

约束：

1. 仅基本运算符：*，+，-，/
2. 只要等式中的数字数为>4和<10，就可以执行任意数量的操作

有什么想法吗？

解决方法

import numpy as np
import random
sNum = 10

#Generate a database by randomly sampling the formulas space,save result into formula_result_dict:
formula_result_dict = {}
for m in range(100000):
    rand_len = np.random.randint(6) + 4
    op_pool = ['/','+','-','*']
    numbers = np.random.randint(1,100,rand_len) #Determine your range,here it's [1,99].
    rand_ops =  random.choices(op_pool,k=rand_len-1)
    str_to_eval = ''.join([str(numbers[k//2]) if k%2==0 else rand_ops[k//2] for k in range(rand_len-1+rand_len)])
    evaluated = eval(str_to_eval)
    if formula_result_dict.get(evaluated) is None:
        formula_result_dict[evaluated] = [str_to_eval]
    else:
        formula_result_dict[evaluated].append(str_to_eval)
        
#Now,let's say we want to generate a random formula,just pick a random formula from the relevant key:
formula = random.choice(formula_result_dict[sNum])
print(formula)
sNum == eval(formula)