factorial_python.py

# Python program to find the factorial of a number provided by the user.

# change the value for a different result
num = 10

# uncomment to take input from the user
#num = int(input("Enter a number: "))

factorial = 1

# check if the number is negative, positive or zero
if num < 0:
 print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
 print("The factorial of 0 is 1")
else:
 for i in range(1,num + 1):
 factorial = factorial*i
 print("The factorial of",num,"is",factorial)