wtfpython

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The explanation of "The chicken-egg problem" says:

The relationship between object and type can't be reproduced in pure python. To be more precise the following relationships can't be reproduced in pure Python,

class A is an instance of class B, and class B is an instance of class A.
class A is an instance of itself.

But it seems that's easy with __instancecheck__ and __subclasscheck__. Or am I mistaken?

Additionally, one occurrence of "python" has a small "p".

But it seems that's easy with instancecheck and subclasscheck. Or am I mistaken?

Yeah, I think the wording of the explanation is a bit ambiguous. Yes, you can override these methods to whatever logic you want. But it is not possible to achieve the said behaviour with their default implementation.