[Python-Dev] Nested scopes core dump

[Michael Hudson]

Jeremy Hylton <jeremy@alum.mit.edu> writes:

> >>>>> "MWH" == Michael Hudson <mwh21@cam.ac.uk> writes:
> 
>   MWH> [*] I thought that if you used the same keys when you were
>   MWH> iterating over a dict you were safe.  It seems not, at least as
>   MWH> far as I could tell with mounds of debugging printf's.
> 
> I did, too.  Anyone know what the problems is?  

The dict's resizing, it turns out.

I note that in PyDict_SetItem, the check to see if the dict needs
resizing occurs *before* it is known whether the key is already in the
dict.  But if this is the problem, how come we haven't been bitten by
this before?

Cheers,
M.

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