<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[xxpresent的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/xxpresent</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; xxpresent]]></copyright><item><title><![CDATA[python字典]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/80555747</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/80555747</guid><author>xxpresent</author><pubDate>Mon, 04 Jun 2018 15:45:51 +0800</pubDate><description><![CDATA[字典，就是一种通过名字引用值的数据结构。这种结构类型是映射类型。它是一种key-value结构的键值对。键可以是数字、字符串、元组。就像英汉词典一样，可以通过查找某个特定的词语（键），从而找到它的定义（值）。

举个例子：



1.创建和使用字典



字典由多个键及其对应的值组成，字典中的键是唯一的，但值是不唯一的。





2.dict方法：



（1）将列表转换为字典



（2）创建...]]></description><category></category></item><item><title><![CDATA[python字符串系列]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/80554686</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/80554686</guid><author>xxpresent</author><pubDate>Sun, 03 Jun 2018 10:39:11 +0800</pubDate><description><![CDATA[1.find方法用于在长串中查找子串，返回子串中最左位置的下标，如果没找到，则返回-1



2.join方法用于在队列中添加元素



3.lower返回字符串的小写字母版



4.replace返回字符串中所有匹配项均被替换之后得到字符串



5.split将字符串分割成序列





6.strip返回去除两侧（不包含字符串内部）空格的字符串





7.translate与repla...]]></description><category></category></item><item><title><![CDATA[[Linux]NAT和代理服务器]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/74038853</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/74038853</guid><author>xxpresent</author><pubDate>Sat, 01 Jul 2017 13:50:48 +0800</pubDate><description><![CDATA[NAT技术和代理服务器]]></description><category></category></item><item><title><![CDATA[[Linux]CRC校验]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73692097</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73692097</guid><author>xxpresent</author><pubDate>Sat, 24 Jun 2017 15:21:38 +0800</pubDate><description><![CDATA[CRC(Cyclic Redundancy Check),循环冗余校验码，校验方法]]></description><category></category></item><item><title><![CDATA[[Linux]ARP协议]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73662400</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73662400</guid><author>xxpresent</author><pubDate>Sat, 24 Jun 2017 14:37:29 +0800</pubDate><description><![CDATA[ARP协议，MAC地址]]></description><category></category></item><item><title><![CDATA[[Linux]运输层的端口]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73657999</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73657999</guid><author>xxpresent</author><pubDate>Sat, 24 Jun 2017 09:44:34 +0800</pubDate><description><![CDATA[端口，端口分类，常用端口]]></description><category></category></item><item><title><![CDATA[[Linux]守护进程（精灵进程）]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73302337</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73302337</guid><author>xxpresent</author><pubDate>Thu, 15 Jun 2017 21:57:22 +0800</pubDate><description><![CDATA[守护进程]]></description><category></category></item><item><title><![CDATA[[Linux]gdb调试多进程多线程例程]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73194970</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73194970</guid><author>xxpresent</author><pubDate>Tue, 13 Jun 2017 22:00:45 +0800</pubDate><description><![CDATA[gdb，多进程，多线程]]></description><category></category></item><item><title><![CDATA[[Linux]共享内存]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73038575</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73038575</guid><author>xxpresent</author><pubDate>Sun, 11 Jun 2017 22:05:50 +0800</pubDate><description><![CDATA[共享内存]]></description><category></category></item><item><title><![CDATA[[Linux]vi/vim下添加多行注释和取消注释]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73037708</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73037708</guid><author>xxpresent</author><pubDate>Sun, 11 Jun 2017 15:49:56 +0800</pubDate><description><![CDATA[添加注释（Centos）
取消注释]]></description><category></category></item><item><title><![CDATA[[Linux]关于SIGCHLD]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73028750</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73028750</guid><author>xxpresent</author><pubDate>Sun, 11 Jun 2017 14:46:01 +0800</pubDate><description><![CDATA[父进程异步清理子进程，SIGCHLD]]></description><category></category></item><item><title><![CDATA[[Linux]信号量]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/73012529</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/73012529</guid><author>xxpresent</author><pubDate>Sun, 11 Jun 2017 09:27:08 +0800</pubDate><description><![CDATA[信号量，互斥访问，数据锁，PV操作]]></description><category></category></item><item><title><![CDATA[[Linux]线程安全和可重入函数]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72991816</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72991816</guid><author>xxpresent</author><pubDate>Sat, 10 Jun 2017 22:04:29 +0800</pubDate><description><![CDATA[线程安全，可重入函数]]></description><category></category></item><item><title><![CDATA[[Linux]死锁]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72990397</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72990397</guid><author>xxpresent</author><pubDate>Sat, 10 Jun 2017 15:52:15 +0800</pubDate><description><![CDATA[死锁，产生的原因，死锁的必要条件，预防死锁，避免死锁]]></description><category></category></item><item><title><![CDATA[[Linux]继续探究mysleep函数（竞态条件）]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72963513</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72963513</guid><author>xxpresent</author><pubDate>Fri, 09 Jun 2017 17:12:59 +0800</pubDate><description><![CDATA[mysleep的实现，竞态条件]]></description><category></category></item><item><title><![CDATA[linux之信号]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/51863364</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/51863364</guid><author>xxpresent</author><pubDate>Thu, 08 Jun 2017 12:09:52 +0800</pubDate><description><![CDATA[信号产生的方式，处理动作，阻塞信号，信号递达]]></description><category></category></item><item><title><![CDATA[[数据结构]Map和Set]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72895930</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72895930</guid><author>xxpresent</author><pubDate>Wed, 07 Jun 2017 19:28:49 +0800</pubDate><description><![CDATA[map和set的使用，底层的原理]]></description><category></category></item><item><title><![CDATA[[Linux]信号]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72870252</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72870252</guid><author>xxpresent</author><pubDate>Mon, 05 Jun 2017 20:45:52 +0800</pubDate><description><![CDATA[Linux下的信号]]></description><category></category></item><item><title><![CDATA[[Linux]消息队列]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/72851815</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/72851815</guid><author>xxpresent</author><pubDate>Sat, 03 Jun 2017 15:11:46 +0800</pubDate><description><![CDATA[进程间通信的方法----消息队列]]></description><category></category></item><item><title><![CDATA[[linux]wait详解]]></title><link>https://blog.youkuaiyun.com/xxpresent/article/details/71435851</link><guid>https://blog.youkuaiyun.com/xxpresent/article/details/71435851</guid><author>xxpresent</author><pubDate>Mon, 08 May 2017 21:18:58 +0800</pubDate><description><![CDATA[wait：进程等待主要有两种等待方式：阻塞式等待和非阻塞式等待]]></description><category></category></item></channel></rss>