Why no warnings when re-assigning builtin names?

[Dan Stromberg]

On Mon, Aug 15, 2011 at 2:52 PM, Gerrat Rickert <grickert at coldstorage.com>wrote:

> With surprising regularity, I see program postings (eg. on StackOverflow)
> from inexperienced Python users  accidentally re-assigning built-in names.
>

http://pypi.python.org/pypi/pylint checks for this and many other issues.

I don't know if pyflakes or pychecker do.
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