How to format strings in classes using attributes?

Question

I want to format an attribute-string of a class with another attribute of the same class like this:

class Test:
    def __init__(self):
        self.name = None
        self.full_name = 'name, {}'.format(self.name)

    def print_name(self):
        print(self.full_name)

my_object = Test()
my_object.name = 'my_object'

my_object.print_name()

Now it should print 'name, my_object' But it prints 'name, None'

What to do that the string formats with the assigned value of the object?

Matiiss · Accepted Answer · 2022-03-17 10:44:38Z

2

You need to add full_name as a property so that you can add some more logic to it:

class Test:
    def __init__(self):
        self.name = None

    @property
    def full_name(self):
        return f'name, {self.name}'

    def print_name(self):
        print(self.full_name)


my_object = Test()
my_object.name = 'my_object'

my_object.print_name()

Resources:

property function (built-in)

edited Mar 17, 2022 at 10:44

answered Mar 17, 2022 at 10:43

Matiiss

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2 Comments

Olvin Roght Over a year ago

print_name() is quite useless there though.

Matiiss Over a year ago

@OlvinRoght I guess, but it is the same useful as in the OP's code, for example, they also could just use print(self.full_name) or the print_name function could be the one that creates this string or it could be created using __str__ or sth else, but as for learning this is fine, after all their question was about formatting strings using attributes

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