What does the keyword "yield" do?
Posted: Wed Dec 07, 2022 8:50 am
What does the yield keyword do in Python? What exactly does it do?
For example, I'm attempting to comprehend the following code1 from this library:
Code: Select all
def _get_child_candidates(self, distance, min_dist, max_dist):
if self._leftchild and distance - max_dist < self._median:
yield self._leftchild
if self._rightchild and distance + max_dist >= self._median:
yield self._rightchild And now for the caller:
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result, candidates = [], [self]
while candidates:
node = candidates.pop()
distance = node._get_dist(obj)
if distance <= max_dist and distance >= min_dist:
result.extend(node._values)
candidates.extend(node._get_child_candidates(distance, min_dist, max_dist))
return resultTo grasp what yield does, I searched the internet for generators and came across this article, but I couldn't understand it well.
What occurs when the _get child candidates method is called? Is there a list returned? A single component? Is it being called again? When will the phone calls stop?