class Calc():

   @staticmethod
   def add(x, y):
       return x + y

  .
  .
  .

   @staticmethod
   def div(x, y):
       return x / y

   @staticmethod
   def get_numbers():
       num1 = int(input("Enter first number: "))
       num2 = int(input("Enter second number: "))
       return num1, num2

   @staticmethod
   def get_operator():
       operator = input('Please enter an operator (+, -, *, /): ')
    return operator

   @classmethod
   def calculate(cls):
       cls.get_numbers()
       cls.get_operator()
       if operator == '+':
           print(add(num1, num2))
       elif operator == '-':
           print(sub(num1, num2))
       elif operator == '*':
           print(mul(num1, num2))
       elif operator == '/':
           print(div(num1, num2))


Calc.calculate()

Traceback (most recent call last):
  File "calc_feltoltesre.py", line 44, in <module>
     Calc.calculate()
  File "calc_feltoltesre.py", line 32, in calculate
     get_numbers()
 NameError: name 'get_numbers' is not defined