python maximum recursion depth exceeded解决方式

用Python写了一个递归脚本，脚本如下

def fact(n):
    return fact_iter(n, 1)
 
 
def fact_iter(num, product):
    if num == 1:
        return product
    return fact_iter(num - 1, num*product)

执行：fact(1000)

报错如下：

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 12, in fact_iter

return fact_iter(num - 1, num*product)

File "D:/python/spider/qq-music-spider/tt.py", line 10, in fact_iter

if num == 1:

RecursionError: maximum recursion depth exceeded in comparison

报错提示超过最大递归深度。

该问题解决方式为加入如下脚本：

import sys
 
sys.setrecursionlimit(1000000) #例如这里设置为一百万

执行：fact(1000)，能正确出结果了。