[Python-Dev] Improve error message "UnboundLocalError: local variable referenced before assignment"
ncoghlan at gmail.com
Wed Nov 7 16:01:59 CET 2012
On Wed, Nov 7, 2012 at 11:57 PM, Ulrich Eckhardt
<ulrich.eckhardt at dominolaser.com> wrote:
> How about:
> "UnboundLocalError: Local variable 'FONT_NAMES' (created on
> line 11) referenced before assignment."
> What I don't really like is the term "created". Maybe "implicitly created on
> line 11"? Or "implied by line 11"? Or how about "Local variable FONT_NAMES
> (implied by line 11) doesn't refer to an object", to avoid the multiple
> interpretations of the term "assignment"?
Unfortunately, we don't track the information we would need in order
to emit that kind of error message. However, you did give me an idea:
I believe the compiler is actually in a position to emit SyntaxWarning
for functions that have a high chance of triggering UnboundLocalError
when called. With output pointing to *both* problematic lines,
beginners should stand a better chance of figuring out what is going
Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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