Python Error

[Chris Angelico]

On Mon, Jul 30, 2012 at 12:36 AM,  <subhabangalore at gmail.com> wrote:
> If this kind of problems happen, --rare but in my 6 yrs Python experience happened sometimes--then I take a new window, rewrite or copy the earlier code module by module, give a new method name--believe it or not--- works.

If that solves your problem, it may be that you inadvertently shadowed
a built-in - maybe you assigned to "set" or "list" or something.

ChrisA