What is considered an "advanced" topic in Python?

[Ethan Furman]

On 05/29/2015 02:28 PM, Jason Swails wrote:

> ​[...] e.g., if the person creating an Enum subclass didn't bother to correctly
> implement [...] __iter__, and __len__ for their subclass

For __iter__ and __len__ to work on the Enum /class/ it must be defined in the metaclass.

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~Ethan~