Python Program for factorial of a number

Difficulty Level : Basic
Last Updated : 17 Mar, 2021

Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n. For example factorial of 6 is 6*5*4*3*2*1 which is 720.

factorial

Recursive :

python3

# Python 3 program to find
# factorial of given number
def factorial(n):
     
    # single line to find factorial
    return 1 if (n==1 or n==0) else n * factorial(n - 1);
 
# Driver Code
num = 5;
print("Factorial of",num,"is",
factorial(num))
 
# This code is contributed by Smitha Dinesh Semwal

Iterative:

python3

# Python 3 program to find 
# factorial of given number
def factorial(n):
    if n < 0:
        return 0
    elif n == 0 or n == 1:
        return 1
    else:
        fact = 1
        while(n > 1):
            fact *= n
            n -= 1
        return fact
 
# Driver Code
num = 5;
print("Factorial of",num,"is",
factorial(num))
 
# This code is contributed by Dharmik Thakkar

One line Solution (Using Ternary operator):

Python3

# Python 3 program to find
# factorial of given number
 
def factorial(n):
 
    # single line to find factorial
    return 1 if (n==1 or n==0) else n * factorial(n - 1)
 
 
# Driver Code
num = 5
print ("Factorial of",num,"is",
      factorial(num))
 
# This code is contributed
# by Smitha Dinesh Semwal.

Please refer complete article on Program for factorial of a number for more details!

By using In-built function:

Python3

# Python 3 program to find
# factorial of given number
import math
 
def factorial(n):
    return(math.factorial(n))
 
 
# Driver Code
num = 5
print("Factorial of", num, "is",
      factorial(num))
 
# This code is contributed by Ashutosh Pandit

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