Example
The following fragment of Python 3 code defines a function counter
with a local variable x
and a nested function increment
. This nested function increment
has access to x
, which from its point of view is a non-local variable. The function counter
returns a closure containing a reference to the function increment
and increment
's non-local variable x
.
The closure returned by counter
can be assigned to a variable:
Invoking increment
through the closures will give the following results:
Read more about this topic: Closure (computer Science)
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“Our intellect is not the most subtle, the most powerful, the most appropriate, instrument for revealing the truth. It is life that, little by little, example by example, permits us to see that what is most important to our heart, or to our mind, is learned not by reasoning but through other agencies. Then it is that the intellect, observing their superiority, abdicates its control to them upon reasoned grounds and agrees to become their collaborator and lackey.”
—Marcel Proust (18711922)