Python Program for factorial of a number

Last Updated: 05-09-2020

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.

Recursive :

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# 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:

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# 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):

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# 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.