数据结构

list是处理一组有序项目的数据结构，即你可以在一个列表中存储一个 序列 的项目

顾名思义，英语就是列表清单的意思。它是一个可变的数据类型。你可以对它进行操作，添加，搜索，删除。

对list 的简单操作。打印删除，追加。切片这个没说简易教程。看完这个去看廖雪峰的。

shoplist = ['apple','mango','carrot','banana']

print ('i have',len(shoplist),'items to purchase')

print ('these items are:')
for item in shoplist:
    print(item),

print('\ni also have to buy rice.')
shoplist.append('rice')
print('my shopping list is now',shoplist)
print('i will sort my list now')
shoplist.sort()
print('sorted shopping list is',shoplist)
print('the first item i will buy is',shoplist[0])
olditem = shoplist[0]
del shoplist[0]
print('i bougth the',olditem)
print ('my shopping list is now',shoplist)

吃饭去了，吗的，还是茄子排骨