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#!/usr/bin/python3

# Filename : test.py
# author by : www.tutorialpro.org

# Calculate the factorial of a number entered by the user

# Get the number from the user
num = int(input("Please enter a number: "))
factorial = 1

# Check if the number is negative, zero, or positive
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 %d is %d" % (num, factorial))

Please enter a number: 3
The factorial of 3 is 6