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Python入门学习之字符串与比较运算符

Python字符串字符串或串(String)是由数字、字母、下划线组成的一串字符。一般记为:s="a1a2・・・an"(n>=0)它是编程语言中表示文本的数据类型。python的字串列表有2种取值顺序:从左到右索引默认0开始的，最大范围是字符串长度少1从右到左索引默认-1开始的，最大范围是字符串开头如果你的实要取得一段子串的话，可以用到变量[头下标:尾下标]，就可以截取相应的字符串，其中下标是从0开始算起，可以是正数或负数，下标可以为空表示取到头或尾。比如

系统 2019-09-27 17:38:20 2031

Python

Python处理json字符串转化为字典的简单实现

今天一个朋友给个需求：来来{'isOK':1,'isRunning':None,'isError':None}怎么转换成字典好，一看就是json转化很简单，开始：importjsona="{'isOK':1,'isRunning':None,'isError':None}"printjson.loads(a)死活出不来结果，还报错，查了两个小时的百度，没搞明白。最后，直接复制网上的代码，OK，运行成功，可是把我的a变量填进去，不行，报错；开始对比两个变量有

系统 2019-09-27 17:38:00 2031

编程技术

掌握 Ajax

级别：初级BrettMcLaughlin(brett@newInstance.com),作家，编辑,O'ReillyMediaInc.2006年1月04日Ajax由HTML、JavaScript™技术、DHTML和DOM组成，这一杰出的方法可以将笨拙的Web界面转化成交互性的Ajax应用程序。本系列的作者是一位Ajax专家，他演示了这些技术如何协同工作——从总体概述到细节的讨论——使高效的Web开发成为现实。他还揭开了Ajax核心概念的神秘面纱，包括XML

系统 2019-08-29 23:47:22 2031

编程技术

在网页中插入Flv视频文件详细图解

[1b]Flv视频文件的来源[/1b]首先说下这个Flash视频，也就是FlashVideo。为什么要用这个？很显然是需要在网页中播放视频。我们都知道一般的视频文件，要不就是asf格式、wmv格式使用mediaplayer进行播放，要不就是rm格式用RealPlayer播放。这样的问题是，格式的不同就需要选择不同的播放器，这对于本地计算机没有安装相应播放器的用户来说，这些视频根本无法收看。并且，还由于这些文件的容量过大，下载慢，查看也不很流畅。所以，解决播

系统 2019-08-29 23:36:09 2031

编程技术

photoshop结合Flash制作瓢虫动画(二)

这个图像将成为虫虫身上的贴图。有人会说了，三维动画才用贴图啊。嘿嘿，今天大家和我一齐，为平面图加贴图吧。打开这张图像，将其拉入我们的瓢虫图中，设置如图示，改名为“映射”。使用“滤镜”-“扭曲”-“极坐标”-“平面坐标到极坐标”，我们把这张平淡的图像做成围绕型。之所以使用这个扭曲，是因为我们将把它放在虫虫背壳上。得让它看上去有凸起的感觉，我们如果用球面化滤镜的话，可能得到的结果并不理想。用极坐标，虽然它的扭曲结果并不是真正的凸起，但是得到的效果却是最好的，所

系统 2019-08-29 23:35:08 2031

编程技术

完整的简单层拖动代码

howtomakeadragdivision-<ahref="http://www.never-online.net"target="_blank"><ahref="http://www.never-online.net"target="_blank">http://www.never-online.net<</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 23:27:10</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2031</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/15223" title="RIAMeeting第三次活动记录" target="_blank" onclick="return recordId('',)">RIAMeeting第三次活动记录 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/15223" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/9.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15223';}else{window.open('/article/15223');}" style="cursor: pointer;">已经是RIAMeeting的第三次活动了，参加的人越来越多。这也体现了Flex等RIA技术的成长。这次活动除了主题演讲，还增加了分组讨论。第一个主题，kenshin(Flex第一步作者)AIR相关内容。看得出准备的内容很多，时间太少，演示了一个书签的air应用。介绍了air的开发和应用。第二个主题，联想Best4C介绍，据说所有的控件都是他们自己写的。编译后只有200多k。他们现在正在招人。然后统计一下大家关心的话题进行分组讨论1.Flex与后台通信方案2</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 22:25:39</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2031</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/14632" title="自定义RadioButton样式1" target="_blank" onclick="return recordId('',)">自定义RadioButton样式1 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14632" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14632';}else{window.open('/article/14632');}" style="cursor: pointer;">主要是布局：<?xmlversion="1.0"encoding="utf-8"?><LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><RadioGroupandroi</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 22:18:15</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2031</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/14487" title="【首届Google暑期大学生博客分享大赛——2010 A" target="_blank" onclick="return recordId('',)">【首届Google暑期大学生博客分享大赛——2010 A </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14487" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/2.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14487';}else{window.open('/article/14487');}" style="cursor: pointer;">我心目中在Android手机上应该有这样一个应用，它的名字叫《健康饮食专家》：1、能够将饮食的专家系统集成到其中；2、能够为你安排好每天的营养搭配，并且选出该食用哪些水果、菜等；3、能够整合谷歌地图和GIS的功能，为你提供到哪些地方买这些东西比较便利、便宜；【首届Google暑期大学生博客分享大赛——2010Andriod篇】健康饮食专家</span> <p class="auth-span"> <span class="muted"><i 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pointer;">1、在启动配置项中设置classpath2、修改openfire\build\lib\dist目录下的Log4j.xml文件<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPElog4j:configurationSYSTEM"log4j.dtd"><log4j:configurationxmlns:log4j="http://jakarta.apache.org/log4j/"></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 22:10:40</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2031</span></span>  </p> </article><div class="pagination" style="display:;"> <ul><li><a href="/search/apple/1/p/1">首页</a></li> <li class="prev-page"><a href="/search/apple/1/p/2850">上一页</a></li> <li><a href="/search/apple/1/p/2849">2849</a></li><li><a href="/search/apple/1/p/2850">2850</a></li><li class="active"><span>2851</span></li><li><a href="/search/apple/1/p/2852">2852</a></li><li><a href="/search/apple/1/p/2853">2853</a></li> <li class="next-page"><a 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