Python: Is it bad form to raise exceptions within __init__?

Question

Is it a bad form to raise exceptions within __init__? If so, then what is an accepted method of throwing an error when certain class variables are initialized as None or of an incorrect type?

Answer 1

Raising exceptions within __init__() is absolutely fine. There's no other good way to indicate the error condition within a constructor, and there are many hundreds of examples in the standard library where building an object can raise an exception.

The error class is to raise. It is up to you. ValueError is best if the constructor was passed an invalid parameter.

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