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Recursion — Base casesCS 101 · Stage 2 of 3 · Trace factorial

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Mara Osei

Why does my factorial never stop? It just crashes.

Tango

Let's trace it together. Here's your function — what happens when n reaches 0?

factorial.py

def factorial(n):
    return n * factorial(n - 1)

print(factorial(3))

Jonas Weber

It keeps going to −1, −2… there's nothing telling it to stop!

Tango

Exactly, Jonas. Mara - where would you add that stopping rule?

Mara is typing…

Message the room…Send

Tango

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