IllegalStateException is often used in Java when a method is invoked on an object in inappropriate state. What would you use instead in Python?
3 Answers
ValueError seems more like the equivalent to Java's IllegalArgumentException.
RuntimeError sounds like a better fit to me:
Raised when an error is detected that doesn’t fall in any of the other categories. The associated value is a string indicating what precisely went wrong.
Most of the time you don't want to do any special error handling on such an error anyway, so the generic RuntimeError should suffice out of the box.
In case you do want to handle it differently to other errors just derive your own exception from it:
class IllegalStateError(RuntimeError):
pass
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