With: l = [1,2,3]
this: print('{0[0]:d}..{0[2]:d}'.format(l)) gives 1..3 but this: print('{0[0]:d}..{0[-1]:d}'.format(l)) gives: Traceback (most recent call last): File "<string>", line 1, in <fragment> builtins.TypeError: list indices must be integers, not str which seems to me counterintuitive. I expected indexing in a format string to behave as it does elsewhere but this seems not to be true. -- https://mail.python.org/mailman/listinfo/python-list