Scoped change of a global variable

Alex Martelli aleax at aleax.it
Thu Jan 3 09:07:59 CET 2002


"Steven Majewski" <sdm7g at Virginia.EDU> wrote in message
news:mailman.1010015222.20515.python-list at python.org...
>
> [ To follow myself up ] ... but the more Pythonic solution
> would probably be to avoid using global values for defaults
> and to use a class instead:
>
>
> >>> class NameSpace:
> ...     default = 1
> ...     def __init__( self, **kws ):
> ...             for key,value in kws.items():
> ...                     setattr( self, key, value )


In a classic-classes environment, I'd rephrase this __init__ as
the somewhat more compact and faster:

    def __init__(self, **kwds):
        self.__dict__.update(kwds)

Admittedly, your setattr-based approach is more general (e.g. it
works if NameSpace is mixin-inherited from together with some
other mixin that defines __setattr__, while the __dict__.update
approach would bypass __setattr__ in this case).


Alex






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