>>range(600)range(" />
Python 列表的定义 |
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Python中[]和range 的用法
>>> ["china",100,"Python","www.xin3721.com"]
['china', 100, 'Python', 'www.xin3721.com’]
>>> range(600)
range(0, 600)
Python 中list 和 range 结合用法
>>> list(range(50))
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49]
Python访问列表元素 访问列表中元素时,索引是从0开始的。
如 >>> course=["C#","VB.net","SQL Server","JavaScript","CSS"] print(course[0]) C#Python列表修改、添加、插入和删除元素
course=["C#","VB.net","SQL Server","JavaScript","CSS"] course[3]="oracle“ print(course[3].title()) Oracle
course=["C#","VB.net","SQL Server","JavaScript","CSS"];course.append("oracle");print(course[5].title()) OraclePython列表修改、添加、插入和删除元素 course=["C#","VB.net","SQL Server","JavaScript","CSS"]; course.insert(0,"oracle"); print(course[0].title()) Oracle
course=["C#","VB.net","SQL Server","JavaScript","CSS"];del course[1];print(course[1].title()) Sql Server Python列表修改、添加、插入和删除元素 Pop 可以移除列表中的一个元素(默认是最后一个)。 course=["C#","VB.net","SQL Server","JavaScript","CSS"];course.pop();print(len(course)) 'CSS’ 4 course=["C#","VB.net","SQL Server","JavaScript","CSS"];course.pop(1);print(course[1]) 'VB.net' SQL Server
用remove根据值,删除元素 course=["C#","CSS","VB.net","SQL Server","JavaScript"];course.remove("CSS");print(course[1]) VB.netPython 组织列表 利用sort对列表进行永久性排序 按字母顺序进行正序排列 course=["C#","VB.net","SQL Server","JavaScript","CSS"] course.sort() print(course) ['C#', 'CSS', 'JavaScript', 'SQL Server', 'VB.net’]
倒序,则向sort函数传递参数reverse=true course=["C#","VB.net","SQL Server","JavaScript","CSS"];course.sort(reverse=True);print(course) ['VB.net', 'SQL Server', 'JavaScript', 'CSS', 'C#'] 使用函数sorted()对列表进行临时排序 course=["C#","VB.net","SQL Server","JavaScript","CSS"] print(course) print(sorted(course)) print(course) 如果要显示倒序,可以向sorted传递参数reverse=True Python的reverse函数 course=["C#","VB.net","SQL Server","JavaScript","CSS"] print(course) course.reverse(); print(course) Python确定列表的长度 使用函数len()可快速获悉列表的长度,前面已经测试过 访问列表最后一个元素 可以用-1这个下标来访问列表中的最后一个元素 |
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