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L = ['abc', 'ADB', 'aBe']
L[len(L):]=['a1', 'a2'] # append items at the end...
L[-1:]=['a3', 'a4'] # append more items at the end...
… works, but ‘a2’ is missing in the output:
['abc', 'ADB', 'aBe', 'append', 'a1', 'a3', 'a4']
I think that the -1 is pointing at the last element of the list, which gets overwritten by ‘a3’. As described here, you can do a