列表类型内置方法

list（掌握）

1. 用途：多个装备、多个爱好、多门课程。

2. 定义：[]内用逗号分隔的多个任意类型的值。

   like = ['chenglong','zhenzidan','lilianjie']
   print(f'like:{like}')
   
   
   like:['chenglong', 'zhenzidan', 'lilianjie']

   n = list('hello jin')
   print(f'n:{n}')
   
   
   n:['h', 'e', 'l', 'l', 'o', ' ', 'j', 'i', 'n']

3. 常用操作加内置方法：

   优先掌握：

   1.按索引取值（正向取值或反向取值），即可存也可以去

   name_list = ['lol','dnf','cf','qq']
   print(f'name_list:{name}')
   
   
   name_list:['lol', 'dnf', 'cf', 'qq']

   2.切片['索引值':]

   gamename_list = ['lol','dnf','cf','qq']
   print(f'gamename:[0:3:2]:{gamename_list[0:3:2]}')
   
   
   gamename:[0:3:2]:['lol', 'cf']

   3.长度len

   gamename_list = ['lol','dnf','cf','qq']
   print(f'len(gamename_list):{len(gamename_list)}')
   
   
   len(gamename_list):4

   4.成员运算in和not in

   gamename_list = ['lol','dnf','cf','qq']
   print(f"'wzry' in gamename_list:{'wzry' in gamename_list}")
   print(f"'wzry' in gamename_list:{'wzry' not in gamename_list}")
   
   
   'wzry' in gamename_list:False
   'wzry' in gamename_list:True

   5.追加值append

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list.append('wzry')
   
   
   gamename_list:['lol', 'dnf', 'cf', 'qq', 'wzry']

   6.删除del

   gamename_list = ['lol','dnf','cf','qq']
   del gamename_list[3]
   print(f'del gamename_list{gamename_list}')
   
   
   del gamename_list['lol', 'dnf', 'cf']

   7.循环 for i in

   for name in gamename_list :
       print(name)
   
   
   lol
   dnf
   cf
   qq

   需要掌握

   1.insert 在索引前面插入一个值

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list.insert(0,'wx')
   print(f'gamename_list:{gamename_list}')
   
   
   
   gamename_list:['wx', 'lol', 'dnf', 'cf', 'qq']

   2.pop() 删除指定索引的值，默认就是删除最后一个值

   gamename_list = ['lol','dnf','cf','qq']
   print(f'gamename_list.pop:{gamename_list.pop()}')
   print(f'gamename_list.pop:{gamename_list.pop()}')
   
   
   gamename_list.pop:qq
   gamename_list.pop:cf

   3.remove 按照指定的元素删除，如果删除的元素不存在则会报错

   gamename_list = ['lol','dnf','cf','qq']
   print(f"gamename_list.remove(lol):{gamename_list.remove('lol')}")
   print(f'gamename_list.remove(lol):{gamename_list}')
   
   
   
   gamename_list.remove(lol):None
   gamename_list.remove(lol):['dnf', 'cf', 'qq']

   4.count() 获取指定元素的个数

   gamename_list = ['lol','dnf','cf','qq']
   print(f"gamename_list.count('lol'):{gamename_list.count('lol')}")
   
   
   gamename_list.count('lol'):1

   5.index() 获取指定元素的索引，但是只会获取第一次

   gamename_list = ['lol','dnf','cf','qq']
   print(f"gamename_list.index('dnf'):{gamename_list.index('dnf')}")
   
   
   gamename_list.index('dnf'):1

   6.clear() 清除列表

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list.clear()
   print(f"gamename_list.clear():{gamename_list}")
   
   
   
   gamename_list.clear():[]

   7.copy() 复制

   gamename_list = ['lol','dnf','cf','qq']
   print(f'gamename_list.copy():{gamename_list.copy()}')
   
   
   gamename_list.copy():['lol', 'dnf', 'cf', 'qq']

   8.extend() 扩展，把extend里的列表的元素添加到原件列表中

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list2 = ['wzry','kp']
   gamename_list.extend(gamename_list2)
   print(f'gamename_listg:{gamename_list}')
   
   
   gamename_listg:['lol', 'dnf', 'cf', 'qq', 'wzry', 'kp']

   9.reverse 反转列表

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list.reverse()
   print(f'gamename_list:{gamename_list}')
   
   
   
   gamename_list:['qq', 'cf', 'dnf', 'lol']

   10.sort() 排序列表 sort列表的元素必须是同类型

   gamename_list = ['lol','dnf','cf','qq']
   gamename_list.sort()
   print(f'gamename_list:{gamename_list}')
   
   gamename_list.sort(reverse = True)
   print(f'gamename_list:{gamename_list}')
   
   
   
   gamename_list:['cf', 'dnf', 'lol', 'qq']
   gamename_list:['qq', 'lol', 'dnf', 'cf']

   4.存一个值or多个值： 多个值

   5.有序or无序：有序

   hobby_lise = ['run','read','play']
   print(f'first:{id(hobby_lise)}')
   hobby_lise[2] = ''
   print(f'second:{id(hobby_lise)}')
   
   
   first:35407816
   second:35407816

   6.可变or不可变：可变数据类型