This function should take a non-negative integer as an input and return the factorial of that number. The factorial of a non-negative integer n is the product of all positive integers less than or equal to n .
Input: Integer (int).
Output: Integer (int).
assert factorial(0) == 1 assert factorial(1) == 1 assert factorial(5) == 120 assert factorial(10) == 3628800
How it’s used:
- in mathematical applications to calculate permutations and combinations;
- in algorithms to solve problems related to counting arrangements.
- n ∈ N₀
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium