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List concatenation

L = [1, 2] L = L + [3]            # concatenate: slower print L L.append(4)            # faster, but in-place print L L = L + [5, 6]         # concatenate: slower print L L.extend([7, 8])       # faster, but in-place print L L += [9, 10]       # mapped to L.extend([9, 10]) print L