Python data fields initialisation

Question

Seems like an obvious question, but I can't find the answer.

In Python, how do I initialise class data (not instance attributes).

class MyClass:
    DATA = MyClass()

Doesn't work, because MyClass() isn't defined yet.

class MyClass:
    pass

MyClass.DATA = MyClass()

Is confusing to the human reader, linter, IDE and autocomplete.

Is there a more standard way of doing this?

MegaIng · Accepted Answer · 2018-04-30 14:08:23Z

1

You can't. You should typehint it and define it afterwards:

class MyClass:
    DATA: ClassVar['MyClass'] # Will get set afterwards
MyClass.DATA = MyClass()

This should solve the problem for autocomplete(IDE) and human reader. Should also be ok for most linter.

answered Apr 30, 2018 at 14:08

MegaIng

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