python基本数据类型——list

一、创建列表：

li = []li = list()name_list = ['alex', 'seven', 'eric']name_list ＝ list(['alex', 'seven', 'eric'])

二、基本操作：

#append追加name_list = ["zhangyanlin","suoning","nick"]name_list.append('zhang')print(name_list) #count制定字符出现几次name_list = ["zhangyanlin","suoning","nick"]name_list.append('zhang')name_list.append('zhang')name_list.append('zhang')print(name_list.count('zhang')) #extend可扩展，批量往里加数据name_list = ["zhangyanlin","suoning","nick"]name = ["aylin","zhang","yan","lin"]name_list.extend(name)print(name_list) #index找到字符所在的位置name_list = ["zhangyanlin","suoning","nick"]print(name_list.index('nick')) #insert插入，往索引里面插入值name_list = ["zhangyanlin","suoning","nick"]name_list.insert(1,"zhang")print(name_list) #pop在原列表中移除掉最后一个元素，并赋值给另一个变量name_list = ["zhangyanlin","suoning","nick"]name = name_list.pop()print(name) #remove移除,只移除从左边找到的第一个name_list = ["zhangyanlin","suoning","nick"]name_list.remove('nick')print(name_list) #reverse反转name_list = ["zhangyanlin","suoning","nick"]name_list.reverse()print(name_list) #del删除其中元素,删除1到3之间的name_list = ["zhangyanlin","suoning","nick"]del name_list[1:3]print(name_list)

#join将列表元素用指定字符串连接name_list = ["you","are","good"]s = " ".join(name_list)print(name_list)# you are good 

 list源码

 

三、数据类型转换

字符串转列表

s = "你好morra"li = list(s)print(li)OUTPUT:['你', '好', 'm', 'o', 'r', 'r', 'a']

元组转列表

tu = ("你好","alex")li = list(tu)print(li)OUTPUT:['你好', 'alex']

字典转列表

dic = {'k1':'hello','k2':'morra'}l3 = list(dic)              #字典在循环的时候默认只循环keyprint(l3)l4 = list(dic.values())print(l4)l5 = list(dic.items())print(l5)OUTPUT:['k2', 'k1']['morra', 'hello'][('k2', 'morra'), ('k1', 'hello')]

四、可迭代性

l = ['i', 'am', 'spark']# 可以被for循环所迭代for i in l:    print (i)# i am spark

五、可嵌套性

li = ['字符串',('tuple','hh'),{"key1":"value1","key2":"value2"}]print(li[2]["key1"])#输出  value1