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Python使用迭代器打印螺旋矩阵的思路及代码示例

思路螺旋矩阵是指一个呈螺旋状的矩阵，它的数字由第一行开始到右边不断变大，向下变大，向左变大，向上变大，如此循环。螺旋矩阵用二维数组表示,坐标(x,y),即(x轴坐标，y轴坐标)。顺时针螺旋的方向是->右,下,左,上,用数值表示即是x加1格(1,0),y加1格(0,1),x减1格(-1,0),y减1格(0,-1)。坐标从(0,0)开始行走,当超出范围或遇到障碍时切换方向。螺旋矩阵的打印首先要对n*n的数组进行赋值，根据规律可以看出，每一层都是按照右->下->

系统 2019-09-27 17:38:02 2742

Javascript

JavaScript对WORD的操作

1、向word中写入内容首先在word中设置书签，如书签名为bookmark，javascript中可以这样写varword;word=newActiveXObject("Word.Application");varrange=word.Range;word.Visible=true;varpath="filepath";word.Documents.Open(path);range=word.ActiveDocument.Bookmarks("bookm

系统 2019-08-29 23:34:29 2742

Java

你应该知道的 8 个Java 的领军人物

下面将介绍8个Java的领军人物，他们创建了框架，产品，工具或者书籍，并将其捐献给了Java社区，改变了Java的编码方式。8.Tomcat&Ant创始人JamesDuncanDavidson，Tomcat和Ant创始人。Duncan于1970年7月29日生于美国德克萨斯州。主要专注在MacOSX、Java和XML技术。他频繁地在全世界各种会议上演讲，话题范围从开源到高效Java开发。Duncan是ApacheTomcat和ApacheAnt的原创作者，1

系统 2019-08-29 23:33:52 2742

编程技术

重置centos的root密码

CentOS忘记root密码解决办法说明操作系统：CentOS6.0遇到问题：忘记管理员账号root的密码，进不了系统解决办法：重置root密码为123456操作：开机启动系统，在进入系统之前按键盘上面的Esc键，会进入下面的界面系统运维说明操作系统：CentOS6.0遇到问题：忘记管理员账号root的密码，进不了系统解决办法：重置root密码为123456操作：开机启动系统，在进入系统之前按键盘上面的Esc键，会进入下面的界面按键盘上的e键，出现下面界面

系统 2019-08-29 22:48:08 2742

编程技术

使用PreferenceActivity和PreferenceScreen构建

对于每个应用程序来说，都要有一些属于用户自己的设置，满足不同需求。当我们点击menu时，如下：点击settings时，出现：那么这样的效果是怎么实现的呢？我只是来个简单介绍，给自己做备忘，也是给大家点思路吧。在android的路上，我们一起努力吧。这里我们仅说第二个图片效果的实现，第一个图片的效果，想必大家都会了，就是使用menu类的几个方法就可以了。1.PreferenceScreen的使用。首先要定义一下整个布局即使用xml文件夹下的preferenc

系统 2019-08-29 22:38:10 2742

编程技术

htmlparser API

htmlparser所有的filterhtmlparser所有的TagshtmlparserAPI:http://htmlparser.sourceforge.net/javadoc/index.html一般的用法见这里http://gundumw100.iteye.com/blog/704630htmlparserAPI

系统 2019-08-29 22:24:23 2742

编程技术

objective-C 中使用@Class和 #import区别

objective-c中，当一个类使用到另一个类时，并且在类的头文件中需要创建被引用的指针时，如下面代码：A.h文件#import"B.h"@interfaceA:NSObject{B*b;}@end为了简单起见：A类是引用类，B类是被引用类，这里先不考虑A类的实现文件。通常引用一个类有两种办法：一种是通过#import方式引入；另一种是通过@class引入；这两种的方式的区别在于：1、#import方式会包含被引用类的所有信息，包括被引用类的变量和方法；

系统 2019-08-29 22:15:53 2742

CSS

仿iPhone开关式按钮(jQuery+CSS3)

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(jq.browser.versions.mobile) {window.location.href='/article/12046';}else{window.open('/article/12046');}" style="cursor: pointer;">仿快图系统自带图片浏览器应用源码，最近在做一个微博i动态模块，需要查看他人相册照片或者微博内容图片等。看到QQ空间那个效果不错，尝试了不少方法来实现，均不是怎么理想。最初是想通过自定义GroupView和imageView来实现，结果在处理滑动事件和放大的图片拖曳不是很顺畅，自己也没深入解决，期望有高手实现了给分享下。后来看了网上的一些方法和帖子，尝试着拿别人的自定义包做一些修增自用。现在用gallery和imageVIew做的，感觉还不错。放上来最初的小</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">2742</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/11643" title="两种方式配置Hibernate复合主键(修正)" target="_blank" onclick="return recordId('',)">两种方式配置Hibernate复合主键(修正) </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/11643" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/11.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/11643';}else{window.open('/article/11643');}" style="cursor: pointer;">数据库结构createtablecomponent(namevarchar(50)notnull,sexvarchar(50)notnull,descriptionvarchar(50),primarykey(name,sex));主键类，一定要实现Serializable接口，并改写equals和hascode方法packagecomponent;importjava.io.Serializable;importorg.apache.commons.la</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 09:29:52</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">2742</span></span>  </p> 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