Python引入了一个机制：引用计数。引用计数python内部使用引用计数，来保持追踪内存中的对象，Python内部记录了对象有多少个引用，即引用计数，当对象被创建时就创建了一个引用计数，当对象不再需要时，这个对象的引用计数为0时，它被垃圾回收。总结一下对象会在一下情况下引用计数加1：1.对象被创建：x=42.另外的别人被创建：y=x3.被作为参数传递给函数：foo(x)4.作为容器对象的一个元素：a=[1,x,'33']引用计数减少情况1.一个本地引用离
系统 2019-09-27 17:45:58 1974
今天，在完成一个小的python习题，习题的主要内容是读取一个帮助模块，并保存到本地文件。知道是用pydoc进行模块的读取，但是在windows系统下，调用os模块之后，结果总是为空。核心语句：helpfile=os.popen('pydoc%s'%module).read()此语句在Linux下可以正常运行，结果正常。后来发现，在Windows下，该修改为：helpfile=os.popen('python-mpydoc%s'%module).read(
系统 2019-09-27 17:38:03 1974
先使用一些关键参数创建对象实例，如下：>>>p=Publisher(name='Apress',...address='2855TelegraphAve.',...city='Berkeley',...state_province='CA',...country='U.S.A.',...website='http://www.apress.com/')这个对象实例并没有对数据库做修改。在调用``save()``方法之前，记录并没有保存至数据库，像这样：>>
系统 2019-09-27 17:37:48 1974
学Python，想必大家都是从爬虫开始的吧。毕竟网上类似的资源很丰富，开源项目也非常多。Python学习网络爬虫主要分3个大的版块：抓取，分析，存储当我们在浏览器中输入一个url后回车，后台会发生什么？简单来说这段过程发生了以下四个步骤：查找域名对应的IP地址。向IP对应的服务器发送请求。服务器响应请求，发回网页内容。浏览器解析网页内容。网络爬虫要做的，简单来说，就是实现浏览器的功能。通过指定url，直接返回给用户所需要的数据，而不需要一步步人工去操纵浏览
系统 2019-09-27 17:37:39 1974
JUNIT4中,有几个地方要注意一下的,归纳之1@Test(expected=ArithmeticException.class)publicvoidtestDivide(){assertEquals(3,Math.divide(9,3));Math.divide(10,0);//除数不能为0，会抛出异常}junit4中不用trycatach了,用这样声明“@Test(expected=ArithmeticException.class)”Junit4就会
系统 2019-08-29 23:34:25 1974
howtomakeadragdivision-<ahref="http://www.never-online.net"target="_blank"><ahref="http://www.never-online.net"target="_blank">http://www.never-online.net<</span>
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<a class="zj-titles zj-del-target" href="/article/15403" title="zoj 1789 The Suspects" target="_blank" onclick="return recordId('',)">zoj 1789 The Suspects </a>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15403';}else{window.open('/article/15403');}" style="cursor: pointer;">这道题是并查集的题，写过这道题之后，我明白了一点，就是从根上改变所属father域<spanstyle="font-size:18px;">#include<stdio.h>#include<stdlib.h>#include<string.h>#include<math.h>intp[30000+100];inta[30000+100];intfind(intx){if(p[x]==x)returnx;p[x]=find(p[x]);returnp[x]</span>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/15098';}else{window.open('/article/15098');}" style="cursor: pointer;">很多人经常问怎样给人物上色，其实很简单，但一句两句也说不清，今天做了拆了仙龙掌的＜夏日依恋＞。看看能否给大家提供一点帮助。技巧要活学活用，这也只是方法之一。此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：此主题相关图片如下：本文转自：http://www.5uflas</span>
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<a class="zj-titles zj-del-target" href="/article/13228" title="第二章 身份验证——《跟我学Shiro》" target="_blank" onclick="return recordId('',)">第二章 身份验证——《跟我学Shiro》 </a>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/13228';}else{window.open('/article/13228');}" style="cursor: pointer;">目录贴：跟我学Shiro目录贴身份验证，即在应用中谁能证明他就是他本人。一般提供如他们的身份ID一些标识信息来表明他就是他本人，如提供身份证，用户名/密码来证明。在shiro中，用户需要提供principals（身份）和credentials（证明）给shiro，从而应用能验证用户身份：principals：身份，即主体的标识属性，可以是任何东西，如用户名、邮箱等，唯一即可。一个主体可以有多个principals，但只有一个Primaryprincipal</span>
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<a class="zj-titles zj-del-target" href="/article/12100" title="Spring使用JdbcTemplate操作数据库---使用RowCa" target="_blank" onclick="return recordId('',)">Spring使用JdbcTemplate操作数据库---使用RowCa </a>
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<span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/12100';}else{window.open('/article/12100');}" style="cursor: pointer;">首先，假设如下SQL表中有数据username=test1,passwd=test1,address=test1CREATETABLE`login`(`username`varchar(10)defaultNULL,`passwd`varchar(10)defaultNULL,`address`varchar(10)defaultNULL)ENGINE=InnoDBDEFAULTCHARSET=gb2312;配置文件：<?xmlversion="1.0"e</span>
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