Olaf Dabrunz wrote:
> This is an idea to play with.
>
> This variant of the extend() patch implements a fourth, optional
> parameter to extend(). With the parameter the error handling method can
> be selected: "stop" on error (keep partial changes), "cont"inue after
> error or "rollback" changes and return on error.
>
> Documentation is included, and the existing tests have slightly been
> updated to test the error handling. But tests are not complete.
>
> Even extend(list, list2, where, error_action) works: error_action is
> ignored, as list extension does not encounter errors (except for "out of
> memory").
>
> Out of memory error handling is unchanged: for dictionaries, the
> extension always continues, and list extension always stops on the first
> error.
>
> For this reason, "rollback" is really the wrong name for that error
> handling mode, as it never needs to roll back changes: all error checks
> are completed before any changes are made.
>
> But "rollback" implements all-or-nothing behavior (except when
> encountering OOM), and it was the best name I could come up with to
> convey that idea.
>
> Please comment.
Well, it's what anyone could ask for. But I suspect it won't be used
much, while it adds quite a few lines of code.
I don't recall people actually complaining about extend() not doing the
right thing. We have only been discussing making it work as documented.
I think this change adds too much flexibility.
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