NotImplementedError

A subclass of RuntimeError for abstract methods that have not been implemented. Distinct from the built-in NotImplemented singleton, which is returned by binary special methods.

References

https://docs.python.org/3/library/exceptions.html

ruby

NotImplementedError

Raised when a feature is not implemented on the current platform. For example, calling fork on Windows. Also used by libraries to signal abstract methods.

References

https://ruby-doc.org/core/Exception.html

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