如何在python子类的__init__之后执行“ __init__”的一部分？

Question

I have a problem in Python, which I feel should theoretically be possible to solve, but perhaps not in practice. I have a class which has a lot of different subclasses. Each object of the objects of the subclasses get a name based on some properties that are unique to the subclass. After that name is defined, I want for each of them to execute the same method, but based on that name. So I'd like to put that in the __init__ of the parent class, but that bit should be executed AFTER execution of the subclass' __init__ . I suppose I could call some method from the parent class in each of the subclasses' __init__ at the end, but then I would be copying code and that doesn't feel right to me. So I was wondering if there's a more elegant solution.

class Cell(object):
    def __init__(self, some_essential_property=1):
        self.some_essential_property = some_essential_property
        # New execute subclass __init__, so that it can make the name
        # Then:
        self.name = self.make_name()
        print(self.name)

    def make_name(self):
        return 'no_special_name'

class Muscle_cell(Cell):
    def __init__(self, strength='huge'):
        super().__init__()
        self.strength = 'huge'

    def make_name(self):
        return 'muscle_with_' + self.strength + '_strength_and_' + str(self.some_essential_property)

M1 = Muscle_cell()

This will raise an error because strength isn't known as an attribute yet. That's why I'd like to execute certain lines immediately after the subclass __init__ .

Answer 1

A superclass should not depend on a subclass, there are other (more OOP ways) to do what you want in Python.

import abc

class Cell(object):
    def __init__(self, some_essential_property=1):
        self.some_essential_property = some_essential_property

    @property
    def name(self):
        return self.make_name()

    @abc.abstractmethod
    def make_name(self):
        pass

class Muscle_cell(Cell):
    def __init__(self, strength='huge'):
        super().__init__()
        self.strength = 'huge'

    def make_name(self):
        return 'muscle_with_' + self.strength + '_strength_and_' + str(self.some_essential_property)

M1 = Muscle_cell()