Le 01/09/2022 à 23:40, Steve Jorgensen a écrit :
I frequently find that I want to raise an exception when the target of a call
is not in an appropriate state to perform the requested operation. Rather than
choosing between `Exception` or defining a custom exception, it would be nice
if there were a built-in `InvalidStateError` exception that my code could raise.
In cases where I want to define a custom exception anyway, I think it would be
nice if it could have a generic `InvalidStateError` exception class for it to
inherit from.
Of course, I would be open to other ideas for what the name of this exception
should be. Other possibilities off the top of my head are `BadStateError` or
`StateError`.
https://docs.python.org/3/library/exceptions.html#ValueError states that
ValueError is “Raised when an operation or function receives an argument
that has the right type but an inappropriate value, and the situation is
not described by a more precise exception such as |IndexError|
<https://docs.python.org/3/library/exceptions.html#IndexError>.” How would
a "state error" differ from this more precisely? What value would this new
exception type add? Both ValueError and this proposed StateError are very
generic.
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