列表[list]:
列表是Python中最基本的数据结构,列表中每个元素都分配一个位置
列表也称之为数组,数组可分为一维数组,多维数组
#一维数组 list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #多维数组 #二维数组 list1=[1,2,3,4,[51,52,53,54],6,,78] #三维数组 list2=[1,2,3,4,[xiaoming[18,175],xiaola# 列list = [‘吉娃娃1‘,‘吉娃娃2‘,‘吉娃娃3‘,‘吉娃娃4‘]
a1 = list[0] a2 = list[1] a3 = list[2] a4 = list[3] # 按下标取值标 print(‘第0个元素:‘,a1 ) print(‘第1个元素:‘,a2) print(‘第2个元素:‘,a3) print(‘第3个元素:‘,a4) 运行结果: D:\Python\Miniconda3\python.exe 第0个元素: 吉娃娃1 第1个元素: 吉娃娃2 第2个元素: 吉娃娃3 第3个元素: 吉娃娃4 Process finished with exit code 0
列表的基本操作:增、删、改、查
增:
1 # 增 2 方式一: 3 list = [‘Denny‘,‘Jenny‘,‘Lilei‘,‘Hanmeimei‘] 4 #append默认在最后的位置添加元素 5 list.append(‘Liming‘) 6 print(list) 7 8 运行结果: 9 D:\Python\Miniconda3\python.exe 10 [‘Denny‘, ‘Jenny‘, ‘Lilei‘, ‘Hanmeimei‘, ‘Liming‘] 11 Process finished with exit code 0 12 13 14 方式二: 15 list = [‘Denny‘,‘Jenny‘,‘Lilei‘,‘Hanmeimei‘] 16 #在指定位置中填写下标 17 list.insert(2,‘Liming‘) 18 print(list) 19 20 运行结果: 21 D:\Python\Miniconda3\python.exe 22 [‘Denny‘, ‘Jenny‘, ‘Liming‘, ‘Lilei‘, ‘Hanmeimei‘] 23 Process finished with exit code 0
删
# 删 方式一: #删除指定位置的元素 list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] del list[3] print(list) 运行结果: D:\Python\Miniconda3\python.exe [‘Denny‘, ‘Jenny‘, ‘Liming‘, ‘Hanmeimei‘] Process finished with exit code 0 方式二: list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #pop不写指定位置默认删除最后的元素 list.pop() print(list) 运行结果: D:\Python\Miniconda3\python.exe [‘Denny‘, ‘Jenny‘, ‘Liming‘, ‘Lilei‘] Process finished with exit code 0 方式三: list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #pop也可以删除指定位置的元素 list.pop(1) print(list) 运行结果: D:\Python\Miniconda3\python.exe [‘Denny‘, ‘Liming‘, ‘Lilei‘, ‘Hanmeimei‘] Process finished with exit code 0 方式四: list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #remove删除指定元素 list.remove(‘Jenny‘) print(list) 运行结果: D:\Python\Miniconda3\python.exe [‘Denny‘, ‘Liming‘, ‘Lilei‘, ‘Hanmeimei‘] Process finished with exit code 0 方式五: list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #清空列表 list.clear() print(list) 运行结果: D:\Python\Miniconda3\python.exe [] Process finished with exit code 0
改
#改 list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] list[1] = ‘xiaoming‘ print(list) 运行结果: D:\Python\Miniconda3\python.exe [‘Denny‘, ‘xiaoming‘, ‘Liming‘, ‘Lilei‘, ‘Hanmeimei‘] Process finished with exit code 0
查
list = [‘Denny‘,‘Jenny‘,‘Liming‘,‘Lilei‘,‘Hanmeimei‘] #根据下标进行查询 a = list[1] #-1取最后一个元素 b = list[-1] print(a) print(b) 运行结果: D:\Python\Miniconda3\python.exe Jenny Hanmeimei Process finished with exit code 0
原文地址:https://www.cnblogs.com/Amei1992/p/8394882.html
时间: 2024-10-11 15:19:08