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Challenge 8: Factorializer

curriculum/challenges/english/blocks/daily-coding-challenges-python/681cb1b0dab50c87ddb2e519.md

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--description--

Given an integer from zero to 20, return the factorial of that number. The factorial of a number is the product of all the numbers between 1 and the given number.

  • The factorial of zero is 1.

--hints--

factorial(0) should return 1.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(factorial(0), 1)`)
}})

factorial(5) should return 120.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(factorial(5), 120)`)
}})

factorial(20) should return 2432902008176640000.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(factorial(20), 2432902008176640000)`)
}})

--seed--

--seed-contents--

py
def factorial(n):

    return n

--solutions--

py
def factorial(n):
    result = 1
    for i in range(1, n + 1):
        result *= i
    return result