How to return instance of a class from its static attribute in python

Question

Just curious, Is it possible to keep static attrs in a class that returns instantiated objects for the same class? Specifically not using a factory method but attr

class Money:
    CENT = Money('cent')

    def __init__(self, value):
        self.value = value

Money.CENT    #==> Returns Money('cent')

The best I could come up with is, But not within the same class.

class SampleMoney:
    CENT = Money('cent')
    DOLLAR = Something('dollar')

SampleMoney.CENT #==> Money('cent')

Why would you want to do that, I am sure there is a better way to serve your use case. — Shubham
– Shubham, Commented Mar 17, 2017 at 3:11
Yes, that's what I was thinking. Using a method is the factory pattern — Ananth Rao
– Ananth Rao, Commented Mar 17, 2017 at 3:12
Just put Something.EMPTY = Something('empty') after the class definiton. — Dietrich Epp
– Dietrich Epp, Commented Mar 17, 2017 at 3:15

Eric · Accepted Answer · 2017-03-17 03:17:37Z

1

You could use the following hack to create a class property:

class Something:
    class __metaclass__:
        @property
        def EMPTY(cls):
            return cls('empty')

Alternatively, just define it after?

class Something:
    # ...

Something.EMPTY = Something('empty')

answered Mar 17, 2017 at 3:17

Eric

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