How to automatically call specific class method after it's initialization?

Question

Let's imagine i have class

class NewSettingsAdded:  # type: NewSettingsAdded
    def __init__(self, system: str, org_id: ):

        self.system = system
        self.org_id = org_id

    def find_head_organization(self):
        "do some prepare"

    def process(self):
    " process"

I would like to after instance initialization automatiucally call only find_head_organization for self. I tried to do something like

class OrganisationCaller(type):
    def __call__(cls, *args, **kwargs):

        obj = type.__call__(cls, *args, **kwargs)
        obj.new_init()
        return obj


class NewSettingsAdded:  # type: NewSettingsAdded
    def __init__(self, system: str, org_id: int,):

    __metaclass__ = OrganisationCaller

    self.system = system
    self.org_id = org_id

    def find_head_organization(self):
        "do some prepare"

    def process(self):
        " process"

But in this approach, it calls all methods after initialisation

why don't you just call find_head_organization at the end of __init__ in NewSettingsAdded? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 22, 2020 at 8:39
Yes, i can do this, i am just trying to find another way, maybe from decorator or something — Alex Nikitin
– Alex Nikitin, Commented Jan 22, 2020 at 8:45
But why? You can easily create a decorator for __init__ that calls some other function, but again, why? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 22, 2020 at 8:46

Baktiyar Bekbergen · Accepted Answer · 2020-01-22 09:36:03Z

2

If your goal is for the object to be "automatically executed upon class instantiation", just put self.run() in the init:

def __init__(self):
    self.bar = 1
    self.run()

edited Jan 22, 2020 at 9:36

Baktiyar Bekbergen

3842 gold badges4 silver badges26 bronze badges

answered Jan 22, 2020 at 8:50

Ayushi Mistry

364 bronze badges

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