python之列表==增删查改操作

1、增 ===》append,extend,insert1.append ==>在列表中的最后数据添加数据。例如：In [22]: list1=["zhang",123,"li","zhao",3456]In [23]: list1Out[23]: ['zhang', 123, 'li', 'zhao', 3456]In [24]: list1.append('qing')In [25]: list1Out[25]: ['zhang', 123, 'li', 'zhao', 3456, 'qing']In [26]: list1.append(234)In [27]: list1Out[27]: ['zhang', 123, 'li', 'zhao', 3456, 'qing', 234]In [28]: list1.append(" ")In [29]: list1Out[29]: ['zhang', 123, 'li', 'zhao', 3456, 'qing', 234, ' '

2、extend ===》可以将一个集合中的元素逐一添加到列表中例如：In [30]: list1=["zhang",123,456]In [31]: list2=["qing",789]In [32]: list1.append(list2)In [33]: list1Out[33]: ['zhang', 123, 456, ['qing', 789]]In [34]: list1.extend(list2)In [35]: list1Out[35]: ['zhang', 123, 456, ['qing', 789], 'qing', 789

3、insert ===》insert(index,str)在指定位置index前插入元素str例如：In [36]: list1=['zhang',"qing",12,34]In [37]: list1Out[37]: ['zhang', 'qing', 12, 34]In [38]: list1.insert(1,23)In [39]: list1Out[39]: ['zhang', 23, 'qing', 12, 34]In [40]: list1.insert(0,1)In [41]: list1Out[41]: [1, 'zhang', 23, 'qing', 12, 34]