STINNER Victor added the comment:
"But that isn't quite true. It is the callback associated with the future that
is displaying the result and stopping the loop."
I wrote this example to show that setting the result of a future can schedule a
callback. I mean something like:
"In this example, the future is used to link slow_operation() to got_result():
when slow_operation() is done, got_result() is called with the result."
The main idea behind Future is to chain callbacks and the link is done
externally. It's different from this design:
def slow_operation(done_callback):
...
done_callback()
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<http://bugs.python.org/issue22473>
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