python maximum recursion depth exceeded解决方式

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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 syssys.setrecursionlimit(1000000) #例如这里设置为一百万
执行：fact(1000)，能正确出结果了。
但是，好像只可以执行到  fact(3930) 左右。
执行：fact(3930)，报错如下：
Process finished with exit code -1073741571 (0xC00000FD)
该问题可参考这篇博文，此处不再做具体讨论：
http://blog.csdn.net/vblittleboy/article/details/6613815

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