RecursionError: maximum recursion depth exceeded in comparison in Python
Dung Do Tien
Aug 15 2021
184
Hello Everyone, I have a small project with Python 3.8.2 and I have created a method to help find numbers with recursive as below:
def find_number(n):
if n == 0 or n == 1:
return 1
else :
return (n * find_number(n-1))
print("Factorial is :", find_number(10))
It works very well for me and returns 3628800. But when I set the param value to 1000 I got the error RecursionError: maximum recursion depth exceeded in comparison
print("Factorial is :", find_number(1000))
Traceback (most recent call last):
File "main.py", line 7, in <module>
print("Factorial is :", find_number(1000))
File "main.py", line 5, in find_number
return (n * find_number(n-1))
File "main.py", line 5, in find_number
return (n * find_number(n-1))
File "main.py", line 5, in find_number
return (n * find_number(n-1))
[Previous line repeated 995 more times]
File "main.py", line 2, in find_number
if n == 0 or n == 1:
RecursionError: maximum recursion depth exceeded in comparison
I still do not understand why it occurs. How can I fix it?
Have 2 answer(s) found.
-
J0
Jair Rojas Garcia Aug 15 2021
I think the best practice to avoid this error is to use other loops instead of recursion. Like:
def find_number(n): num = 1 for i in range(2, n + 1): num = num * i return num print("Factorial is :", find_number(1000))It works very well for me.
-
G0
Giang Nguyen Aug 15 2021
You can use
sys.setrecursionlimit()function to help increase the max number for recursive:import sys sys.setrecursionlimit(2000)
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