列表

列表

 

列表的引入：

a1 = "老王"

a2 = "老李"

a3 = "老刘"

#列表

names = ["老王","老李","老刘"]     #定义了一个列表

nums = [11,22,3.14,"100","laowang","老李"]       #可以存储不同类型的数据

 

列表的增删改查：

append添加到原有列表的最后

names.append("老赵")           #   ["老王","老李","老刘","老赵"]

names.append("悟空")           #   ["老王","老李","老刘","老赵","悟空"]

insert

name.insert(位置，要添加的内容）

names.insert(0,"八戒")          #   ["八戒","老王","老李","老刘","老赵","悟空"]

names.insert(2,"沙僧")          #   ["八戒","老王","沙僧","老李","老刘","老赵","悟空"]

names2 = ["葫芦娃","叮当猫","猴子"]

合并两个列表:

name3 = names + names2   #    ["八戒","老王","沙僧","老李","老刘","老赵","悟空","葫芦娃","叮当猫","猴子"]

names.extend(names3)      #压栈    ["八戒","老王","沙僧","老李","老刘","老赵","悟空","八戒","老王","沙僧"，"老李","老刘","老赵","悟空","葫芦娃","叮当猫","猴子"]

names.pop()        #弹栈  返回"猴子"       列表剩余：["八戒","老王","沙僧","老李","老刘","老赵","悟空","八戒","老王","沙僧"，"老李","老刘","老赵","悟空","葫芦娃","叮当猫"]

注意：

li = [23,24,25,26]
li1 = [31,32]

区别：
li.extend(li1)              # [23, 24, 25, 26, 31, 32]

li.append(li1)            # [23, 24, 25, 26, [31, 32]] 

 

 

names.remove("老王")   #根据内容删除，只删除一次    列表剩余：["八戒","沙僧","老李","老刘","老赵","悟空","八戒","老王","沙僧","老李","老刘","老赵","悟空","葫芦娃","叮当猫"]

names[0]          names[1]         names[2]

names[2:5]             #        ["老李","老刘","老赵"]

 

del names[0]          #   删除"八戒"   ["沙僧","老李","老刘","老赵","悟空","八戒","老王","沙僧","老李","老刘","老赵","悟空","葫芦娃","叮当猫"]

 

总结：

添加新元素：

append()

insert()

extend()

删除元素：

pop()                ->删除最后一个

remove()          ->根据内容删除

del xxx[下标]    ->根据下标来删除

 

查询：in      not in

name[0] = "沙师弟"           # 改       ["沙师弟","老李","老刘","老赵","悟空","八戒","老王","沙僧","老李","老刘","老赵","悟空","葫芦娃","叮当猫"]

if "老赵" in names:

    print("找到了...")

if "老赵" not in "names":

    print("可以添加老赵")

 

posted on 2019-07-28 13:34 qiaoliang0302 阅读( ...) 评论( ...) 编辑 收藏

转载于:https://www.cnblogs.com/ql0302/p/11258690.html