Calling a function from outside class with user input without using global-CodePudding

I am trying to avoid using global, instead I created a class. I am having trouble calling the class, instead, I am getting the following error

TypeError: phone.__init__() missing 1 required positional argument: 'NUMBER_INPUT'

Any ideas? Thanks in advance!

class phone:
    
        def __init__(self,NUMBER_INPUT):
            self.NUMBER_INPUT = NUMBER_INPUT
    
        def phone_number(self):
            """validate user input of phone number"""
            while True:
                self.NUMBER_INPUT = input("Please enter your phone number: ")
                if  re.fullmatch(r"\d{3}-\d{3}-\d{4}" ,self.NUMBER_INPUT):
                    print("You phone number is: "   self.NUMBER_INPUT)
                    break
                print("Please enter a valid phone number ex. 123-456-5678")
    
    phone().phone_number()

CodePudding user response：

So, I think you neither did read documentation nor watched/read any tutorial about Python classes. So I will explain it here for you.

Class is a "object project". It may have predefined methods, predefined values. It also may have a way to construct these dynamically.

Class object at first need to be instantiated and then initiated. That means that firstly you need to create an instance of a class, then to initiate default values.

Python has 2 methods for this.

__new__() creates a new instance of a class and returns it. It's already realised for every Python class, but there may be special cases for you to override it.

__init__(*args, **kwargs) initiates values of a class. You must define non-static values here or globally in class.

So, creating a class object is achieved in python by calling class like this

A_instance = A(*args, **kwargs)

That in words means create me instance of A with these args and kwargs

So in your code, you are using (actualy overriding) __init__(*args, **kwargs) with args = (NUMBER_INPUT,) and kwargs = None.

Thus you must provide NUMBER_INPUT every time you create an object of phone, like so:

phone1 = phone("123-456-7890")
phone2 = phone("098-765-4321")

CodePudding user response：

You must provide a value for NUMBER_INPUT when calling phone() like phone("123").phone_number().

But it would be better if you will use dummy value for NUMBER_INPUT in constructor like:

class phone:
    
        def __init__(self):
            self.NUMBER_INPUT = ""
    
        def phone_number(self):
            """validate user input of phone number"""
            while True:
                self.NUMBER_INPUT = input("Please enter your phone number: ")
                if  re.fullmatch(r"\d{3}-\d{3}-\d{4}" ,self.NUMBER_INPUT):
                    print("You phone number is: "   self.NUMBER_INPUT)
                    break
                print("Please enter a valid phone number ex. 123-456-5678")
    
phone().phone_number()