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Extend is more suitable (and faster) when you need to "append" more than one thing at a time (any iterable).
Since I need to add two items (left and right), it is preferable.
N.B.: I could also have used a simple "+=" (which is infinitesimally faster), but this is more explicit and I prefer it for such things.
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Extend is more suitable (and faster) when you need to "append" more than one thing at a time (any iterable). Since I need to add two items (left and right), it is preferable.
N.B.: I could also have used a simple "+=" (which is infinitesimally faster), but this is more explicit and I prefer it for such things.