static decorator - python

staticmethod.py

class Multiply:
   def __init__(self, numbers):
        self.numbers = numbers
    
    def __call__(self):
        print(f"multiply {self.numbers}")
        self.checker(self.numbers)
        self.result = 1
        for num in self.numbers:
            self.result *= num
        print(self.result)
    
    @staticmethod
    def checker(numbers):
        for num in numbers:
            if type(num) != int:
                raise Exception("Accepts only integers.")
            
valid = Multiply([1,2,3])
invalid = Multiply([1,2,"three"])
valid()
invalid()

# Outputs
😅  ››› python3 static_decorator.py 

#Valid
multiply [1, 2, 3]
6 

# Not Valid
multiply [1, 2, 'three']
Traceback (most recent call last):
  File "medium.py", line 56, in <module>
    invalid()
  File "medium.py", line 40, in __call__
    self.checker(self.numbers)
  File "medium.py", line 50, in checker
    raise Exception("Accepts only integers.")
Exception: Accepts only integers.