String To Dict Problem

[Michael Spencer]

Clodoaldo Pinto wrote:
> Michael Spencer wrote:
> 
>> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/364469
> 
> Very nice work. It will be very useful. Thanks.
> 
> Only a small problem when I try to evaluate this:
> 
> safe_eval('True')
> 
> I get:
> 
> Traceback (most recent call last):
>   File "safe_eval.py", line 63, in ?
>     safe_eval('True')
>   File "safe_eval.py", line 59, in safe_eval
>     return walker.visit(ast)
>   File "safe_eval.py", line 19, in visit
>     return meth(node, **kw)
>   File "safe_eval.py", line 23, in default
>     return self.visit(child, **kw)
>   File "safe_eval.py", line 19, in visit
>     return meth(node, **kw)
>   File "safe_eval.py", line 47, in visitName
>     node.name, node)
> __main__.Unsafe_Source_Error: Line 1.  Strings must be quoted: True
> 
> This is just to let you know. I can live with that. I just replace True
> for 1.
> 
> Regards, Clodoaldo Pinto
> 
Alternatively, you could edit visitName to allow 'True' and any other 
identifiers you specify e.g. (untested):

     allowed = {"True": True, "False": False}
     def visitName(self,node, **kw):
	try:
             return self.allowed[node.name]
         except KeyError:
             raise Unsafe_Source_Error("Strings must be quoted",
                                  node.name, node)

Cheers
Michael