'''
static method
https://builtin.com/software-engineering-perspectives/python-cls
'''


class Math:
  @staticmethod
  def factorial(number):
        if number == 0:
            return 1
        else:
            return number * MethodTypes.factorial(number - 1)
       
factorial = MethodTypes.factorial(5)
print(factorial)

Error:
Traceback (most recent call last):
  File "<string>", line 15, in <module>
NameError: name 'MethodTypes' is not defined

import math

class OwnMath:
    
    @staticmethod
    def factorial(number):
      if number == 0:
          return 1
      else:
          return number * OwnMath.factorial(number - 1)


if __name__ == '__main__':
    
    n = 9
    
    factorial1 = math.factorial(n)  # using math library
    factorial2 = OwnMath.factorial(n)  # using "OwnMath" class + recursive method
    
    print(f"factorial1 with math library = {factorial1}")
    print(f"factorial2 with proper implementation= {factorial2}")

Quote:The difference between the keywords self and cls reside only in the method type. If the created method is an instance method then the reserved word self to be used, but if the method is a class method then the keyword cls must be used.

Quote:A static method in Python must be created by decorating it with @staticmethod.

def func(number):
    result = 1
    for value in range(1, number+1):
        result *= value
    return result


class Math:
    pass

Math.factorial = func

print(Math.factorial(5))

(Feb-02-2024, 09:37 AM)paul18fr Wrote: maybe the following snippet gives you some answers:

import math

class OwnMath:
    
    @staticmethod
    def factorial(number):
      if number == 0:
          return 1
      else:
          return number * OwnMath.factorial(number - 1)


if __name__ == '__main__':
    
    n = 9
    
    factorial1 = math.factorial(n)  # using math library
    factorial2 = OwnMath.factorial(n)  # using "OwnMath" class + recursive method
    
    print(f"factorial1 with math library = {factorial1}")
    print(f"factorial2 with proper implementation= {factorial2}")