区别：首先，条形图是用条形的长度表示各类别频数的多少，其宽度（表示类别）则是固定的；直方图是用面积表示各组频数的多少，矩形的高度表示每一组的频数或频率，宽度则表示各组的组距，因此其高度与宽度均有意义。其次，由于分组数据具有连续性，直方图的各矩形通常是连续排列，而条形图则是分开排列。最后，条形图主要用于展示分类数据，而直方图则主要用于展示数据型数据，我们初中学的就是条形统计图，很显然有没有当初那种感觉？（身高-年龄条形统计图）在坐标上画出每个年龄对应的频数。
系统 2019-09-27 17:54:48 2671
前言提起selenium想必大家都不陌生，作为一款知名的Web自动化测试框架，selenium支持多款主流浏览器，提供了功能丰富的API接口，经常被我们用作爬虫工具来使用。但是selenium的缺点也很明显，比如速度太慢、对版本配置要求严苛,最麻烦是经常要更新对应的驱动。今天就给大家介绍另一款web自动化测试工具Pyppeteer，虽然支持的浏览器比较单一，但在安装配置的便利性和运行效率方面都要远胜selenium。01.Pyppeteer简介介绍Pypp
系统 2019-09-27 17:53:10 2671
在Python3.5（含）以前，字典是不能保证顺序的，键值对A先插入字典，键值对B后插入字典，但是当你打印字典的Keys列表时，你会发现B可能在A的前面。但是从Python3.6开始，字典是变成有顺序的了。你先插入键值对A，后插入键值对B，那么当你打印Keys列表的时候，你就会发现B在A的后面。不仅如此，从Python3.6开始，下面的三种遍历操作，效率要高于Python3.5之前：forkeyin字典forvaluein字典.values()forkey
系统 2019-09-27 17:51:02 2671
简介没有切换开销。因为子程序切换不是线程切换，而是由程序自身控制，没有线程切换的开销，因此执行效率高，不需要锁机制。因为只有一个线程，也不存在同时写变量冲突，在协程中控制共享资源不加锁，只需要判断状态就好了，所以执行效率比多线程高很多Python对协程的支持还非常有限，用在generator中的yield可以一定程度上实现协程。yield传统的生产者-消费者模型是一个线程写消息，一个线程取消息，通过锁机制控制队列和等待，但一不小心就可能死锁。如果改用协程，
系统 2019-09-27 17:47:08 2671
Python机器学习及实践——基础篇：无监督学习经典模型（特征降维）特征降维不仅可以重构有效的低维度特征向量，同时也为数据展现提供了可能。在特征降维的方法种，主成分分析（PrincipalComponentAnalysis,PCA）是最为经典和实用的特征降维技术，特别是辅助图像识别方法有突出的表现。1.主成分分析线性相关矩阵秩计算样例importnumpyasnp#初始化一个2*2的线性相关矩阵M=np.array([[1,2],[2,4]])#计算2*2
系统 2019-09-27 17:45:46 2671
前天周六，有个好友过来玩，他说想在他的网站中加入地图导航模块，但不知道选择哪个第三方MapAPI在网上查了下Baidu、Google、QQ和MapBar等4种MapAPI（都是采用JS开放API），也查看了它们的SDK开发文档，谈谈自己的体会MapAPI文档BMapAPI（Baidu）与google.mapsAPI（Google）文档相对最完备、详尽、简洁，并且给出了很多学习示例，非常适合初学者入门学习、应用开发QMapAPI（QQ）与MapBarAPI（
系统 2019-08-29 23:53:13 2671
1.引言一般情况下，安装Linux需要从光驱用安装光盘启动机器，然后进入交互式安装界面输入安装所需
系统 2019-08-29 23:40:03 2671
基本应用层的TCP/IP协议介绍(HTTP/FTP/POP/SMTP)来源：http://www.networkdictionary.com/chinese/protocols/tcpip.phpHTTP：超文本传输协议更详细的HTTP协议头信息参考我blog之前的文章。HTTP：超文本传输协议HTTP：HypertextTransferProtocol超文本传输协议（HTTP）是应用层协议，由于其简捷、快速的方式，适用于分布式和合作式超媒体信息系统。自1
系统 2019-08-29 23:27:27 2671
原帖子发表在http://community.csdn.net/Expert/TopicView.asp?id=4069144author:emu(黄希彤)有csdn的朋友把http://community.csdn.net/Expert/TopicView.asp?id=3191873给翻了出来，这样在javascript中模拟多线程又有了更漂亮的做法了：1emu--用fason的参数化定时器模拟多线程</title</span>
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