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[Libvir] Proposal: Python bindings should turn NO_DOMAIN/NO_NETWORK errors in KeyError exceptions

I propose that we should change the Python bindings so that when the virterror errors VIR_ERR_NO_DOMAIN and VIR_ERR_NO_NETWORK occur in the lookup* functions only, should cause KeyError to be raised.

According to:


"[KeyError is] raised when a mapping (dictionary) key is not found in the set of existing keys."

I've already changed the OCaml bindings so that these errors get converted into Not_found exception, which is the "natural" exception for when something is looked up and not found.


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