eval modifies passed dict

[colas.francis at gmail.com]

On 14 avr, 17:23, Janto Dreijer <jan... at gmail.com> wrote:
> It seems eval is modifying the passed in locals/globals. This is
> behaviour I did not expect and is really messing up my web.py app.
>
> Python 2.5.1 (r251:54863, Mar  7 2008, 04:10:12)
> [GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> d = dict(a=1)
> >>> d.keys()
> ['a']
> >>> eval("a", d)
> 1
> >>> d.keys()
>
> ['a', '__builtins__']
>
> That can't be right.

>From the documentation of eval[1]
"If the globals dictionary is present and lacks '__builtins__', the
current globals are copied into globals before expression is parsed."

[1]http://docs.python.org/lib/built-in-funcs.html