>>> lis = [] >>> lis = lis + [1] >>> lis [1] >>> lis = lis + [2] >>> lis [1, 2] >>> lis += [3] # += acts like list.extend, i.e changes the list in-place >>> lis [1, 2, 3]
>>> lis = [] >>> lis = lis + [1] >>> lis [1] >>> lis = lis + [2] >>> lis [1, 2] >>> lis += [3] # += acts like list.extend, i.e changes the list in-place >>> lis [1, 2, 3]