python - 数据结构list

3t4342

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

长度:len(shoplist)
追加：shoplist.append('rice')
指定位置插入:shoplist.insert(2, 'new')
遍历：
for item in shoplist:
    print item,

排序（升序）：shoplist.sort()
下标访问：shoplist[0]
范围: shoplist[0:3],得到['apple', 'mango', 'carrot'], 获取全部shoplist[:]

获取下标：shoplist.index('mango')
删除：del shoplist[0]或 shoplist.remove('apple')
删除末尾：shoplist.pop()或 del shoplist[-1]

记住列表的赋值语句不创建拷贝。你得使用切片操作符来建立序列的拷贝，比如cppy_list = shoplist[:]


列表综合：
listone = [2, 3, 4]
listtwo = [2*i for i in listone if i > 2] #[6, 8]