dict for an object not showing @property attribute

Question

When using decorators, I am setting an attribute through "setter" decorator, however it doesn't show up in object's dict. Below is my code

class Employee: def __init__(self, first, last): self.f_name = first self.l_name = last self.email = self.f_name + '.' + self.l_name + '@hotmail.com' @property def fullname(self): return ('{} {}'.format(self.f_name,self.l_name) ) @fullname.setter def fullname(self, name): first, last = name.split(' ') self.f_name = first self.l_name = last self.email = self.f_name + '.' + self.l_name + '@hotmail.com' emp_1 = Employee('Sandeep', 'Behera') print(emp_1.__dict__) emp_1.fullname = "Alex Smith" print(emp_1.__dict__) emp_1.age = 20 print(emp_1.__dict__)

Running above, the result is :

{'f_name': 'Sandeep', 'l_name': 'Behera', 'email': '[email protected]'} {'f_name': 'Alex', 'l_name': 'Smith', 'email': '[email protected]'} {'f_name': 'Alex', 'l_name': 'Smith', 'email': '[email protected]', 'age': 20}

Why the "fullname" isn't showing up in the Dict even when I am assigning

emp_1.fullname = "Alex Smith"

but it shows "age" attribute. Does it have to do something with decorators? Thanks in advance.

Why the "fullname" isn't showing up in the Dict even when I am assigning? The same reason why __init__ doesn't show up in the __dict__. It's method of your class. It's just decorated with @property which makes it look like an attribute but it is not an attribute. — sahinakkaya
– sahinakkaya, Commented Dec 12, 2020 at 19:07

Goldbach · Accepted Answer · 2020-12-12 19:22:15Z

Your decorated setter does not create an attribute fullname. Adding a new line to your setter as follows will give you an attribute full_name:

@fullname.setter def fullname(self, name): first, last = name.split(' ') self.f_name = first self.l_name = last self.email = self.f_name + '.' + self.l_name + '@hotmail.com' self.full_name = name # creating an attribute full_name

The result is as follows:

{'f_name': 'Sandeep', 'l_name': 'Behera', 'email': '[email protected]'} {'f_name': 'Alex', 'l_name': 'Smith', 'email': '[email protected]', 'full_name': 'Alex Smith'} {'f_name': 'Alex', 'l_name': 'Smith', 'email': '[email protected]', 'full_name': 'Alex Smith', 'age': 20}

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