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Showing content from https://mail.python.org/pipermail/python-dev/2002-May/024434.html below:

[Python-Dev] _tkinter problem with Stackless

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Greg Ewing <greg@cosc.canterbury.ac.nz> writes:

> Am I right in thinking that a problem can only
> occur if a tasklet switch occurs between the time
> the local variable is created and the time it's
> used? If the same tasklet is running both times,
> the stack should be back in it's right place.

Not necessarily. Christian segments the stack into slices, and only
keeps the top-of-stack slice on the stack. So even within a single
tasklet, you cannot refer to stack variables of your callers, if those
callers are far away.

Regards,
Martin

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