Python: Are these the same object, what's going on?

[MooMoo]

Right, heres the piece of code:

class Circuit:
 
    pass
 
class Workspace:
 
    Circuits = {}
    Components = {}
 
 
WORKSPACES = {}
 
 
WORKSPACES["a"] = Workspace()
WORKSPACES["b"] = Workspace()
WORKSPACES["c"] = Workspace()
 
#WORKSPACES["a"].Circuits["r"] = Circuit()
 
print WORKSPACES["a"].Circuits
print WORKSPACES["b"].Circuits
print WORKSPACES["c"].Circuits
 

Now, the output from this is:

{'r': <__main__.Circuit instance at 0x04AD2E90>}
{'r': <__main__.Circuit instance at 0x04AD2E90>}
{'r': <__main__.Circuit instance at 0x04AD2E90>}

but this isn't what I'm expecting, or what I want. TO put it best, I want the behavoius that matches this output:

{'r': <__main__.Circuit instance at 0x04AD2E90>}
{}
{}


Can anyone explain to me what's goig on here, and how I can get the behaviour I want?

[jlm699]

What's going on is your class is not correct. You need to initialize your class with an __init__ function and use the self reference; otherwise all instances of this class will reference the same variables.

>>> class Workspace2:
...     def __init__(self):
...         self.Circuits = {}
...         self.Components = {}
...     
>>> Workspaces2['a'] = Workspace2()
>>> Workspaces2['b'] = Workspace2()
>>> Workspaces2['c'] = Workspace2()
>>> Workspaces2['a'].Circuits['r'] = Circuit()
>>> print Workspaces2['a'].Circuits
{'r': <__main__.Circuit instance at 0x01C894E0>}
>>> print Workspaces2['b'].Circuits
{}
>>> print Workspaces2['c'].Circuits
{}
>>>