variable scope
Joel Juvenal Rivera Rivera
joelriv at gmail.com
Fri Sep 25 19:00:49 EDT 2009
Yeah i forgot the self an try the code then i see
an error that it was not defines _uno__a so that's
where i define the global and see that behavior.
Thanks for your answers
El vie, 25-09-2009 a las 15:14 -0700, Ethan Furman escribió:
> Joel Juvenal Rivera Rivera wrote:
> > Hi i was playing around with my code the i realize of this
> >
> > ###################
> > _uno__a = 1
> > class uno():
> > __a = 2
> > def __init__(self):
> > print __a
> > uno()
> > ###################
> > and prints 1
> >
> > So when i create class uno in the __init__ calls the global _uno__a when
> > i refer just __a ? it's some kind of "private global" variable?
> >
> > Regards
> >
> > Joel Rivera
> >
>
>
> Wow, that's interesting. Looks like you have simultaneously kicked in
> name mangling[1], while not using the 'self' notation to specify an
> instance variable and not a global variable.
>
> For an instance variable you should use self.__a, not just __a. And you
> don't want to use two leading underscores until you know what you're
> doing. :-)
>
> [1] http://www.python.org/doc/1.5/tut/node67.html
> http://docs.python.org/reference/expressions.html
> in 5.2.1 Identifiers
>
>
> Hope this helps!
>
> ~Ethan~
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