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python之yield表达式学习

python中有一个略微奇怪的表达式叫yieldexpression，本文就来探究一下这是个什么东西。一步一步来。iterable复制代码代码如下:mylist=[1,2,3]foriteminmylist:printstr(item)mylist是一个列表（list），我们可以逐条取出每一个item，这个过程叫做iteration。像list这样可以用”for…in…”依次遍历的对象被称为iterable，其他的iterable还有string、tupl

系统 2019-09-27 17:45:37 2230

Python

Python3.6+selenium2.53.6自动化测试_判断元素是否存在

环境：编辑工具：浏览器：有问题可以联系qq：1776376537#coding:utf-8#导入包fromcommon.baseimportBase#导入写好的公共包fromseleniumimportwebdriverfromselenium.webdriver.common.action_chainsimportActionChainsfromselenium.webdriver.support.selectimportSelect#打开浏览器driv

系统 2019-09-27 17:45:32 2230

Python

使用Python导出Excel图表以及导出为图片的方法

本篇讲下如何使用纯python代码将excel中的图表导出为图片。这里需要使用的模块有win32com、pythoncom模块。网上经查询有人已经写好的模块pyxlchart，具体代码如下：fromwin32com.clientimportDispatchimportosimportpythoncomclassPyxlchart(object):"""ThisclassexportschartsinanExcelSpreadsheettotheFileSy

系统 2019-09-27 17:37:59 2230

编程技术

eclipse + JBoss 5 + EJB3开发指南（11）：实体

本文为原创，如需转载，请注明作者和出处，谢谢！上一篇：eclipse+JBoss5+EJB3开发指南（10）：通过继承实体Bean，将单个表映射成多个表（单表策略，SINGLE_TABLE）在上一篇文章中，使用单表策略将一个表从逻辑上分成了多个表。但这样可能会造成空巢字段，也就是说，一个逻辑表只由部分字段组成，而物理的表的很多字段的值就会为null。为了解决这个问题，可以将t_accounts表物理地分成多个表。为了与t_accounts表进行对比，新建一

系统 2019-08-29 23:31:11 2230

编程技术

AOP 的利器：ASM 3.0 介绍(4)

ASM3.0编程框架ASM通过树这种数据结构来表示复杂的字节码结构，并利用Push模型来对树进行遍历，在遍历过程中对字节码进行修改。所谓的Push模型类似于简单的Visitor设计模式，因为需要处理字节码结构是固定的，所以不需要专门抽象出一种Vistable接口，而只需要提供Visitor接口。所谓Visitor模式和Iterator模式有点类似，它们都被用来遍历一些复杂的数据结构。Visitor相当于用户派出的代表，深入到算法内部，由算法安排访问行程。V

系统 2019-08-29 23:29:57 2230

编程技术

奢华六宗最

SixTricksOfLuxuryGames1珠宝再昂贵，也要珠宝是点亮贫瘠地球的一个火种，给了所有女人最美丽的奢华梦想。复杂到维多利亚时代的镶嵌珠宝，简单到Tiffany造型简约的银饰设计，珠宝让最平凡的衣装也闪出光芒，把你照亮。Stylepoints造型夸张的珠宝是当下流行，在party中一件夺目的闪耀珠宝可以让你立刻成为全场焦点。珍珠和钻石是喜欢低调简约风格的OL们投资珠宝的首选。钻石耳坠Cupid18K白金南洋黑珍珠钻饰项链Mikimoto高级珠宝

系统 2019-08-29 22:46:31 2230

编程技术

ext中ComboBox+Ajax+分页联动代码和注释

今天花了1下午时间研究出了ComboBox+Ajax+分页联动效果.ext学习初步见效下面代码直接就能运行,用list模拟了数据库中取数据以下是目录结构以下是代码test1.jsp<%@pagelanguage="java"import="java.util.*"pageEncoding="UTF-8"%></span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:28:19</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2230</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12156" title="二叉树遍历--递归实现" target="_blank" onclick="return recordId('',)">二叉树遍历--递归实现 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12156" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/5.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12156';}else{window.open('/article/12156');}" style="cursor: pointer;">递归这东西真是抽象，我看着看着算法，就囫囵吞枣地的写了下，写得囧了···这次先用递归实现先序，中序，后序遍历算法。先大概说下原理：我输入一大串字符，中间#就是代表了空，基本的储存结构就是二叉链表。主要就是二叉树的创建和三种顺序的遍历。二叉树的创建通过从左孩子开始创建不断递归，知道读取了#，开始创建对应的右孩子，继续递归。访问的时候对于三种顺序不过就是对于操作的顺序改变而已。对于下面的程序，按照图里面的二叉树建立方式：输入ABD#G###CE##FH###就</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:30:11</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2230</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12094" title="网站统计：第一方Cookie和第三方Cookie" target="_blank" onclick="return recordId('',)">网站统计：第一方Cookie和第三方Cookie </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12094" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/8.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12094';}else{window.open('/article/12094');}" style="cursor: pointer;">什么是Cookie？Cookie是您访问过的网站创建的文件，用于存储浏览信息，例如您的网站偏好设置或个人资料信息。共有两种类型的Cookie：第一方Cookie是由地址栏中列出的网站域设置的Cookie，而第三方Cookie来自在网页上嵌入广告或图片等项的其他域来源。Cookie可以用来提升用户体验，比如网站可以使用Cookie来记录用户的登录状态，用户只要登录一次就可以不用登录了，购物网站通过Cookie来保存购物车中的商品等。同时很多的网站分析都是依靠</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:30:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2230</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/12055" title="呼拉拉一片陈一舟和王兴PK声" target="_blank" onclick="return recordId('',)">呼拉拉一片陈一舟和王兴PK声 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/12055" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/10.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12055';}else{window.open('/article/12055');}" style="cursor: pointer;"><iframealign="center"marginwidth="0"marginheight="0"src="http://www.zealware.com/csdnblog336280.html"frameborder="0"width="336"scrolling="no"height="280"></iframe>昨天怎么了，玩聚算出来呼拉拉一片博文、新闻都是陈一舟和王兴PK，看了半天这个玩聚热点故事才知道事情的来龙去脉。之前，老是从各种小道bl</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-12 09:30:07</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2230</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/oom/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/oom/1/p/2460">上一页</a></li> <li><a href="/search/oom/1/p/2459">2459</a></li><li><a href="/search/oom/1/p/2460">2460</a></li><li class="active"><span>2461</span></li><li><a href="/search/oom/1/p/2462">2462</a></li><li><a href="/search/oom/1/p/2463">2463</a></li> <li class="next-page"><a href="/search/oom/1/p/2462">下一页</a></li> <li><a href="/search/oom/1/p/2924">末页</a></li> <li><span>共 2924页,共29234条</span></li> </ul> </div> </div> </div>   <style type="text/css"> .d_postlist .text { /* height: 30px; */ display: block; /* height: 100%; */ font-size:14px !important; width:85%; } .zj-dynamic-info li{ margin: 10px 3px; } .zj-dynamic-info .zj-a{ color: blue; cursor: pointer; } </style> <aside class="sidebar"> <div class="widget d_postlist"> <div class="title"> <h2>站内搜索</h2> </div> <ul> <li><div class="zj-search-box zj-pc-search-box"> <form class="searchform themeform" role="form" action="/search" method="get"> <input style="font-size: 120%; margin-top: 10px;" type="ext" class="search" name="search_word" placeholder="搜索从这里开始..." value=""> <i class="fa fa-search"></i> <button class="btn btn-primary" type="button" style="margin-left: -4px;height: 36px !important;"> <span class="zj-icon-text">搜索</span> </button> </form> </div></li> </ul> </div>    <div class="widget d_postlist"> <div class="title"> <h2>加入交流</h2> </div> <ul> <li class="zj-no-wx-app"><a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=f6d1df60dbb7ebc94c2c8a67b1e094e1e90677df1e943d9547d425b81bb218a5"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qq-qun.png" alt=""></span><span class="text">1. 手机QQ扫左侧二维码</span><span class="text">2. 搜Q群：542395358</span> <span class="text">3. 点击<img style="cursor: pointer;" onclick="window.open('//shang.qq.com/wpa/qunwpa?idkey=f6d1df60dbb7ebc94c2c8a67b1e094e1e90677df1e943d9547d425b81bb218a5');" border="0" src="//pub.idqqimg.com/wpa/images/group.png" alt="张军网站共享资料群" title="张军网站共享资料群"> </span></a></li> <li class="zj-no-wx-app"><a target="_blank" href="//shang.qq.com/wpa/qunwpa?idkey=29dfc8d27e6e13276b9ea9848e3a211c076e130376a7b6ef380ffcc967e8a1fc"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qq-qun.png" alt=""></span><span class="text">1. 手机QQ扫左侧二维码</span><span class="text">2. 搜Q群：922215567</span> <span class="text">3. 点击<img style="cursor: pointer;" onclick="window.open('//shang.qq.com/wpa/qunwpa?idkey=29dfc8d27e6e13276b9ea9848e3a211c076e130376a7b6ef380ffcc967e8a1fc');" border="0" src="//pub.idqqimg.com/wpa/images/group.png" alt="java技术沟通群" title="java技术沟通群"> </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-gzh.jpg" alt="关注企业微信公众号"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信中搜索：上海加盾信息科技有限公司</span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-app-zhangjunbk.jpg" alt="关注军军小站|张军博客小程序"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信搜索小程序：张军博客 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx-app-shanghaijiadun.jpg" alt="关注企业微信小程序"></span><span class="text">1.手机微信扫左侧二维码 </span><span class="text">2. 微信搜索小程序：上海加盾信息科技有限公司</span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/dingding.jpg" alt="关注企业钉钉"></span><span class="text">关注企业钉钉 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/qywx-my.png" alt="关注企业微信"></span><span class="text">关注企业微信 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/wx.zhangjunbk.com.png" alt="微信扫一扫添加张军网站微信群"></span><span class="text">微信扫一扫添加张军网站微信群 </span></a></li> <li><a target="_blank" href="javascript:void(0)" style="cursor: text;"><span style="margin-right: 10px;" class="thumbnail"><img style="max-height: 100%;" src="/Public/static/images/my-wx.png" alt="添加我为微信好友"></span><span class="text">微信扫一扫加我为好友 </span></a></li> </ul> </div>  <div class="widget d_tag"> <div class="title"> <h2>标签云</h2> </div> <div class="d_tags"> <a title="金融业务" href="/tag/37" onclick="return recordId('tid',37)">金融业务 (4)</a><a title="教育资料" href="/tag/39" onclick="return recordId('tid',39)">教育资料 (10)</a><a title="Java" href="/tag/41" onclick="return recordId('tid',41)">Java (901)</a><a title="C++" href="/tag/42" onclick="return recordId('tid',42)">C++ (86)</a><a title="C#" href="/tag/43" onclick="return recordId('tid',43)">C# (215)</a><a title="Python" href="/tag/44" onclick="return recordId('tid',44)">Python (9022)</a><a title="Oracle" href="/tag/45" onclick="return recordId('tid',45)">Oracle (911)</a><a title="SqlServer" href="/tag/46" onclick="return recordId('tid',46)">SqlServer (681)</a><a title="MySql" href="/tag/47" onclick="return recordId('tid',47)">MySql (600)</a><a title="DB2" 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