Charles Krug wrote:
> List:
>
...
> # expensive Object Module
>
> _expensiveObject = None
> def ExpensiveObject():
>
> if not(_expensiveObject):
> _expensiveObject = "A VERY Expensive object"
>
> return _expensiveObject
>
...
> I obviously missed some part of the scoping rules.
>
> What's the correct way to do this?
>
> Thanx
>
>
> Charles
>
As the traceback says:
> UnboundLocalError: local variable '_expensiveObject' referenced before
assignment
By assigning to _expensiveObject in the function you make _expensiveObject a
local identifier (no matter which code path is followed). The easiest 'fix'
for
your code is to insert a global statement:
_expensiveObject = None
def ExpensiveObject():
global _expensiveObject # Without this, _expensiveObject is local
# because of the assignment below
if not(_expensiveObject):
_expensiveObject = "A VERY Expensive object"
return _expensiveObject
[See: http://docs.python.org/ref/naming.html for more details]
But there is likely to be a more elegant solution, depending on what your real
code looks like.
HTH
Michael
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