We've previously seen how to create a nested function in Python.
If you return a nested function from a function, that nested function has access to the variables defined in that function, even if that function is not active any more.
Here is a simple counter example.
count = 0
count = count + 1
increment = counter()
We return the
increment() inner function, and that has still access to the state of the
count variable even though the
counter() function has ended.
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