Python bug with dictionary

[Ben Finney]

On Mon, 21 Jul 2003 20:27:32 -0400, none wrote:
> class Dict:
>     items = {}
>     name = ""

These attributes belong to the class, and are not distinct between
instances.  (For the same reason, all the functions you define in the
class become methods, shared between all instances.)

If you want each instance to have attributes distinct from other
instances, set them during the instance's initialisation:

=====
>>> class Foo( object ):
...     def __init__( self, name = None ):
...         self.items = {}
...         self.name = name
...     def addItem( self, item ):
...         self.items[ item.name ] = item
...
>>> class Bar( object ):
...     def __init__( self, name = None ):
...         self.name = name
...
>>> bar1 = Bar( "bar1" )
>>> bar2 = Bar( "bar2" )
>>> bar3 = Bar( "bar3" )
>>> bar4 = Bar( "bar4" )
>>>
>>> foo1 = Foo( "foo1" )
>>> foo2 = Foo( "foo2" )
>>>
>>> foo1.addItem( bar1 )
>>> foo1.addItem( bar2 )
>>>
>>> foo2.addItem( bar3 )
>>> foo2.addItem( bar4 )
>>>
>>> foo1.name
'foo1'
>>> foo1.items.keys()
['bar1', 'bar2']
>>>
>>> foo2.name
'foo2'
>>> foo2.items.keys()
['bar3', 'bar4']
>>>
=====

I've also changed two other things: don't name objects (of any kind)
after reserved words like "dict", you'll just lead to confusion.  Don't
bother with redundant getBlah() and setBlah() methods; just access the
attributes directly, using __getitem__() and __setitem__() in the few
cases where you actually need to intervene.

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