First factorial

Description

Have the function FirstFactorial(num) take the num parameter being passed and return the factorial of it. For example: if num = 4, then your program should return (4 * 3 * 2 * 1) = 24. For the test cases, the range will be between 1 and 18 and the input will always be an integer.

My solutions

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def solution1(num): 
    first = 1
    for factor in range(2, num + 1):
        first *= factor
    return first

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from functools import reduce

def solution2(num):
    return reduce(lambda x, y: x * y, range(1, num + 1))