How does the property decorator work in Python with example explained

Ok property decorators are used so that you can define a method as a "getter" for a class attribute, In simple words you can access methods as attributes rather than methods. Have look in this example.

Getter Example

class Main:


    def __init__(self, name):
        self._name = name


    @property
    def name(self):
        return self._name
    
obj =  Main("Roger")
print(obj.name)

This outputs the name "Roger", But note inside print we are calling name as attribute

Setter Example

class Main:


    def __init__(self, name):
        self._name = name


    @property
    def name(self):
        return self._name
    
    @name.setter
    def name(self, new_name):
        self._name = new_name
    
obj =  Main("Roger")
obj.name = "Manu"
print(obj.name)

Here we are using setter and then later setting name as "Manu", which outputs as Manu.

Deleter Example

class Main:


    def __init__(self, name):
        self._name = name


    @property
    def name(self):
        return self._name
    
    @name.setter
    def name(self, new_name):
        self._name = new_name


    @name.deleter
    def name(self):
        del self._name
    
obj =  Main("Roger")
obj.name = "Manu"
del obj.name
print(obj.name)

Here print gives an error "AttributeError: 'Main' object has no attribute '_name'. Did you mean: 'name'"

But if we change code before print like

obj =  Main("Roger")
obj.name = "Manu"
#del obj.name
print(obj.name)

Now we get output as "Manu". As delete is not deleting the value.