list，tuple，string，bytes对象可以进行切片处理，生成一个新的这些类的对象。
格式：li[start: stop: step]
list切片：
1 >>> li = [‘Michael‘, ‘Sarah‘, ‘Tracy‘, ‘Jack‘, ‘Black‘] 2 >>>li[0] 3 ‘Michael‘ 4 >>>li[-1] 5 ‘Black‘ 6 >>>li[1:3] 7 [‘Sarah‘, ‘Tracy‘] 8 >>>li[:3] 9 [‘Michael‘, ‘Sarah‘, ‘Tracy‘] 10 >>>li[-2:] 11 [‘Jack‘, ‘Black‘] 12 >>>li[:] 13 [‘Michael‘, ‘Sarah‘, ‘Tracy‘, ‘Jack‘, ‘Black‘] 14 >>>li[::2] 15 [‘Michael‘, ‘Tracy‘, ‘Black‘]
tuple切片：
1 >>> li = (‘Michael‘, ‘Sarah‘, ‘Tracy‘, ‘Jack‘, ‘Black‘) 2 >>> li[0] 3 ‘Michael‘ 4 >>> li[-1] 5 ‘Black‘ 6 >>> li[1:3] 7 (‘Sarah‘, ‘Tracy‘) 8 >>> li[-2:] 9 (‘Jack‘, ‘Black‘) 10 >>> li[:] 11 (‘Michael‘, ‘Sarah‘, ‘Tracy‘, ‘Jack‘, ‘Black‘) 12 >>> li[::2] 13 (‘Michael‘, ‘Tracy‘, ‘Black‘)
string切片：
1 >>> s = ‘abcdefgh‘ 2 >>> s[0] 3 ‘a‘ 4 >>> s[-1] 5 ‘h‘ 6 >>> s[1:3] 7 ‘bc‘ 8 >>> s[-2:] 9 ‘gh‘ 10 >>> s[:] 11 ‘abcdefgh‘ 12 >>> s[::2] 13 ‘aceg‘
bytes切片(注：python3有bytes类型，python2没有)：
1 >>> a = b‘abcdef‘ 2 >>> a[0] 3 97 4 >>> a[-1] 5 102 6 >>> a[1:3] 7 b‘bc‘ 8 >>> a[-2:] 9 b‘ef‘ 10 >>> a[:] 11 b‘abcdef‘ 12 >>> a[::2] 13 b‘ace‘
