Checking whether an object has been created.

[Fredrik Lundh]

Olivier CARRERE wrote:
> has anyone a clean method to check if an object has been instanciated?
>
> What I wish to do is to create an object if it hasn't been made before,
> ie something like this :
>
> if not exists(objectReference):
> objectReference=Object()
> # perform stuff on objectReference

objectReference = None

...

if objectReference is None:
    objectReference = Object()

...

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