Antoon Pardon wrote:
> Op 2005-12-16, Larry Bates schreef <[EMAIL PROTECTED]>:
>> Antoon Pardon wrote:
>>> I have the following little piece of code:
>>>
>>> class Cfg:pass
>>> #config = Cfg()
>>>
>>> def assign():
>>> setattr(config, 'Start' , [13, 26, 29, 34])
>>>
>>> def foo():
>>> config = Cfg()
>>> dct = {'config':config, 'assign':assign}
>>> exec "assign()" in dct
>>> print config.Start
>>>
>>> foo()
>
>> [ ... ]
>>
>> You should probably post what you are trying to do. Maybe we
>> can make a suggestion about the best approach.
>
> I'm using PLY. The assign function is a dumbded down version
> of a production function that will be called during the parsing
> of a config file. Each time a line of the form:
>
> var = val
>
> is encounterd I do setattr(config, 'var', val)
>
> The problem is that doing it this way means config needs to be global.
> which I'm trying to avoid, in case some leftovers may cause trouble
> when I read in a new configuration or should I ever have different
> threads parsing files at the same time.
>
> The other way would be passing the 'config' variable around in the
> productions, but this would complicate things.
>
> So what I am trying to do was provide a global namespace to the call
> to fool a function using a global name into using a provided local name.
Maybe you could use a bound method?
class Cfg:
def assign(self):
setattr(self, 'Start' , [13, 26, 29, 34])
def foo():
config = Cfg()
namespace = dict(assign=config.assign)
exec "assign()" in namespace
print config.Start
Peter
--
http://mail.python.org/mailman/listinfo/python-list
