Apr 8, 2025 · The factorial of a number is the product of all positive integers less than or equal to that number. For example, the factorial of 5 (denoted as 5!) is 5 × 4 × 3 × 2 × 1 = 120. In Python, we can calculate the factorial of a number using various methods, such as loops, recursion, built-in functions, and other approaches.

Here, the number whose factorial is to be found is stored in num, and we check if the number is negative, zero or positive using if...elif...else statement. If the number is positive, we use for loop and range() function to calculate the factorial.

Jan 6, 2022 · The easiest way is to use math.factorial (available in Python 2.6 and above): If you want/have to write it yourself, you can use an iterative approach: fact = 1. for num in range(2, n + 1): fact *= num. return fact. or a recursive approach: if n < 2: return 1. else: return n * factorial(n-1)

Here is the Python program for calculating the factorial of a number: Python Program for Factorial def factorial(n): if n == 0: return 1 else: return n * factorial(n-1) You can run this code on our free Online Python Compiler.

Mar 20, 2025 · This Python tutorial explains, how to print factorial of a number in Python, Python program to print factorial of a number using function, Python program to find factorial of a number using while loop, etc.

Aug 16, 2024 · Use the if-elif-else statement to check if the input number is negative, 0, or positive. For a positive input integer, we will call the function and print the factorial of the given input number. Using math module – factorial()

Aug 12, 2024 · The above python program to find factorial of a number takes the input of positive numbers only, and it does have a check of negative numbers in it using the if and else statement of python. In this program, the factor is 1 when j equals 1.

Jul 7, 2021 · Step 1 - Define function factorial () to calculate factorial. Step 2 - Check if the entered number is 1 or 0, if true return the number. Step 3 - If false, call the function recursively to calculate factorial of the number minus 1. Step 4 - Return the value of the number multiplied by the factorial of the number minus 1. Step 5 - Print the result.

Jan 15, 2020 · In this article, we would discuss how to find factorial of a number through Python program. First, we would illustrate it using for loop and if-else statement . Subsequently, to get the desired outcome we will use factorial function defined in math module .

Aug 10, 2018 · return n * factorial(n - 1) if n > 1 else 1. It recurses until the input number is 1, where it finally returns the result (in the case of n=0, it returns 1 since 0!=1). The solution also uses the ternary operator fit an if...else into one line. Note that python has a maximum recursion, so factorial(x) where x >= 999 will result in a RecursionError.