Chris Angelico writes:

 > but at very least, if it isn't *obvious*, it should at least be
 > *unsurprising* if you then get UnboundLocalError.

+1 I think this (== "obvious in hindsight") is probably a better
criterion than "obvious" (from the definition) when an error *will* be
raised.  (That's as a general principle.  Ie, it doesn't need to be
obvious that you will *get* feedback from the system when you do
something, but it should be obvious what the feedback means when you
*do* get it.)

Steve
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