输入 function 能否用于将参数传递给递归 function？

Question

First time posting here. New to Python and experimenting to try and better understand recursion and the input function. In this code, I'm trying to take user input (x) and pass it to a recursive function. I think it will print a list of (x) numbers, where the difference in each successive number reduces by 1. Whatever it does, I will learn from but I really just want to know what I need to change to take user input and pass it to this recursive function. The code was inspired by this example:

https://www.w3schools.com/python/trypython.asp?filename=demo_recursion

Thanks.

x = int(input("Choose a number "))

def add_last(x):
  result = x + (add_last(x- 1))
  print(result)

add_last(x)

Answer 1

Recursive functions must always have an “end” case, ie, when to end the recursion?

So in add_last , probably add something like:

if x==0:
   return 0

Without an end case you will likely run into a RecursionError: maximum recursion depth exceeded

Answer 2

Since you're just printing, you don't need to return anything.

def add_last(x):
    if x == 0:
        return
    print(x)
    add_last(x-1)

print("\n\nRecursion Example Results")
add_last(6)