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Date: Sun, 11 Mar 2012 04:37:55 -0700
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Subject: Re: newb __init__ inheritance
From: Chris Rebert <clp2@rebertia.com>
To: hyperboogie <hyperboogie@gmail.com>
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On Sun, Mar 11, 2012 at 3:56 AM, hyperboogie <hyperboogie@gmail.com> wrote:
> On Sunday, March 11, 2012 12:38:27 PM UTC+2, Chris Rebert wrote:
>> On Sun, Mar 11, 2012 at 3:18 AM, hyperboogie wrote:
>> <snip>
>> > thank you everyone...
>> > Still things are not working as expected... what am I doing wrong?
>> <snip>
>> > # cat test.py
>> > #!/usr/bin/python
>> >
>> > class A():
>>
>> You should be subclassing `object`, but that's a minor point which
>> isn't the cause of your problem.
>>
>> > =C2=A0 def __init__(self):
>> > =C2=A0 =C2=A0 =C2=A0z=3D1
>>
>> This creates a *local variable* named "z". You want an *attribute*
>> named "z", so you should be doing:
>> =C2=A0 =C2=A0 self.z =3D 1
>> instead. Same problem elsewhere; you must *always* explicitly use
>> `self` when referencing an attribute of the current object. Python !=3D
>> Java or C++.
>>
>> Cheers,
>> Chris
>
> Thanks ... works great now.
> Two last questions:
>
> 1. What do you mean by "subclassing `object`"?

Your classes should (ultimately) subclass the built-in class named
"object". In your case:
    class A(object):
    # =E2=80=A6rest same as before=E2=80=A6

This ensures that your classes are new-style rather than old-style
(the latter is deprecated); see:
http://docs.python.org/glossary.html#term-new-style-class

> 2. Is the mro function available only on python3?

There's never been an mro function. Perhaps you mean the __mro__
attribute of classes (e.g. `B.__mro__`), which is available in Python
2.2+ and Python 3?

Cheers,
Chris