Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
File"<stdin>",line1,in<module> KeyError:‘url’ >>> 嵌套字典使用 get()方法对嵌套字典的使用方法如下: 实例 #!/usr/bin/python # -*- coding: UTF-8 -*- tinydict={‘RUNOOB’:{‘url’:‘docs.gechiui.com/w3school’}} res=tinydict.get(‘RUNOOB’,{}).get(‘url’) ...
/usr/bin/python # -*- coding: UTF-8 -*- site={‘name’:‘菜鸟教程’,‘alexa’:10000,‘url’:‘docs.gechiui.com/w3school’} element=site.pop(‘nickname’,‘不存在的 key’) print(‘删除的元素为:’) print(element) print(‘字典为:’)...