slots — Advanced Playground

Restricts instance attributes to a fixed set for memory savings

Python Playground

# Advanced __slots__ patterns
class AutoInit:
    """Automatically initialize attributes from __init__ parameters."""
    def __init_subclass__(cls, **kwargs):
        super().__init_subclass__(**kwargs)
        import inspect
        init = cls.__dict__.get("__init__")
        if init:
            params = list(inspect.signature(init).parameters.keys())[1:]
            original_init = init

            def new_init(self, *args, **kw):
                original_init(self, *args, **kw)

            cls.__init__ = new_init

class Point(AutoInit):
    def __init__(self, x, y):
        self.x = x
        self.y = y

p = Point(3, 4)
print(vars(p))

Output

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Advanced patterns with __slots__ enable powerful metaprogramming techniques.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Advanced examples for __slots__

__slots__ — Advanced Playground

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slots — Advanced Playground