shoppingList = ['apple','banana','cat','dog','duck']#Indexing and 'subscription operation'print('The first item is',shoppingList[0])print('The second item is',shoppingList[1])print('the third item is',shoppingList[2])print('item -1 is',shoppingList[-1])print('item -2 is',shoppingList[-2])#Slicing on a listprint('Form the 1 to 3 is',shoppingList[1:3])print('From the 2 to 4 is',shoppingList[2:4])print('Form the 1 to -1 is',shoppingList[2:-3])print('From the start to end is',shoppingList[:])#Slicing on a Stringname='keritafranklin'print('From the 1 to 3 is',name[1:3])print('From the 2 to 4 is',name[2:4])print('From the 1 to -1 is',name[1:-1])print('From the start to end is',name[:])#序列的特性：#1、索引操作符#2、切片操作符#  -1指的是最后一个、-2指的是倒数第二个。以此类推#  如果在某个区间没有元素，则返回[]#  如果用这样引用[:]，则表示输出所有元素#  切片时从第一个序列开始，到第二个序列前截止

2015/4/21