List operations
The + operator concatenates lists:
Similarly, the * operator repeats a list a given number of items:

List slices
The slice operator also works on lists:

If you omit the first index, the slice starts at the beginning. If you omit the second, the slice goes to the end. So if you omit both, the slice is a copy of the whole list.
from Thinking in Python

浙公网安备 33010602011771号