Avoiding `exec', how to?

[Chris Liechti]

pinard at iro.umontreal.ca (François Pinard) wrote in
news:mailman.1022792988.25468.python-list at python.org: 
> [holger krekel]
>> 2)  mod = __import__('currentmodulename') 
>>     for name in filter(lambda x: x[0]!='_', dir(defs)):
>>         setattr(mod, name, defs[name])
> ... Your code fragment bears an excellent
> suggestion, by which `dir()' allows getting rid of `__dict__'.  Thanks
> for this tip! 

please not that the output of "dir" has changed over the versions. i think 
there was a message on the group this or last week about that. (it was bout 
dir and classes/types)

> # Fabriquer une variable globale pour chaque élément de DEFS.
> module = sys.modules[__name__]
> for name in dir(defs):
>     if name[0] != '_':
>         setattr(module, name, getattr(defs, name))
> del defs, module, name
> 
> The code would be less clear, for me, if it was using `filter' and
> `lambda'. 
ok i couldn't resist :-)

moddict = __import__(__name__).__dict__
defs = {'a':1, 'b':2}
moddict.update( dict(filter(lambda k: k[0][0]!='_', defs.items())) )
del defs, moddict
 
altough a list comprehension is more readable:

moddict = __import__(__name__).__dict__
defs = {'a':1, 'b':2}
moddict.update( dict([ (k,v) for k,v in defs.items() if k[0]!='_']) )
del defs, moddict, k, v

chris

he, always interesting how a simple questions generate that many traffic on 
the list! (and in your inbox)

-- 
Chris <cliechti at gmx.net>