You need to declare _expensiveObject as global inside your function.
Whenever you assign something to a variable that resides in the global
scope inside a function, you need to declare it as global at the
beginning of the function. So your function should look like this
def ExpensiveObject():
global _expensiveObject
if not(_expensiveObject):
_expensiveObject = "A VERY Expensive object"
return _expensiveObject
The documentation will no doubtedly explain it better than I have
-Farshid
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