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Python Factorial

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The Python Factorial function is one of the Python Math function which is used to find the factorial of a specified expression or an individual number.

In this article we will show you, How to use Factorial in Python Programming language with example.

Syntax of a Python Factorial Function

The basic syntax of the Factorial in Python Programming Language is as shown below:

Math.factorial(number);

Number: It can be a number or a valid numerical expression.

  • If the number argument is positive integer, Factorial() function will return the Factorial of a given number.
  • If the number argument is Negative integer, Factorial() function will return ValueError
  • The number argument is Positive or Negative Decimals, Factorial() function will return ValueError
  • If the number argument is not a number, Factorial() function will return TypeError.

Python Factorial Function Example

The Python Factorial function is used to find the factorial of a given number. In this example, We are going to find the factorial of different data types and display the output

PYTHON CODE

# Python FACTORIAL Function

import math

Tup = (1, 2, 3, 4 , 5) # Tuple Declaration
Lis = [6, 7, 8, 5 , 9] # List Declaration

print('Factoial() Function on Positive Number = %.2f' %math.factorial(3))
print('Factoial() Function on Positive Decimal = %.2f' %math.factorial(6))

print('Factoial() Function on Tuple Item = %.2f' %math.factorial(Tup[2]))
print('Factoial() Function on List Item = %.2f' %math.factorial(Lis[4]))

print('Factoial() Function on Multiple Number = %.2f' %math.factorial(10 + 45 - 48))

print('Factoial() Function on String Value = ', math.factorial('Python'))

OUTPUT
Python FACTORIAL Function

ANALYSIS

  1. At the beginning, We declared Python List and Tuple with some random values.
  2. Within the first two statements, We used the Factorial() Function directly on Positive integers.
  3. Next two statements, We used the Factorial() Function on Python Tuple and List items. If you observe the above screenshot, Factorial() function is working perfectly on them.
  4. Next statement, We tried Factorial() Function directly on multiple values
  5. Here, we used the python Factorial on String value. As we said before, this will return TypeError: an integer is required (got type str) as output
  6. Next, We used Factorial Function on Decimal value. As we said before, this is returning ValueError: factorial() only accepts integral values as output
  7. Last, We tried Factorial() Function on Negative value. As we said before, this is returning ValueError: factorial() not defined for negative values as output

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