采集时,有时候需要采集图片,但某些网站的图片提供的相对地址,最好转换成绝对地址在scrapy中有如下的解决策略http://stackoverflow.com/questions/6499603/python-scrapy-convert-relative-paths-to-absolute-pathshttp://stackoverflow.com/questions/19970015/scrapy-item-..
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编程语言 时间:
2014-08-20 16:38:23
阅读次数:
239
8、BGP优先选择到下一跳IGP度量值最低的路径。不管都是EBGPpeer还是都是IBGPpeer还是分别是联邦EBGP和联邦IBGP都比较这一步。9、当前面的8条选路原则都无法优选出最优路由时,并且在BGP进程下面配置了maximum-paths[ibgp]<1-16>,那么将执行等价负载均衡,如果没有ibgp关键..
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其他好文 时间:
2014-08-20 10:36:36
阅读次数:
281
1、在Documents里创建目录创建一个叫test的目录,先找到Documents的目录,[cpp]view plaincopyNSArray*paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMas...
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移动开发 时间:
2014-08-19 15:52:24
阅读次数:
317
首先,新建一个工程,到Build Phases-link Binary With Libraries,点+添加libxml2运行库再到build settings中搜索Header search Paths,双击该选项第一行添加/usr/include/libxml2 此步骤为添加头文件把HTML....
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Web程序 时间:
2014-08-18 09:14:43
阅读次数:
292
Background
Problems that require minimum paths through some domain appear in many different areas of computer science. For example, one of the constraints in VLSI routing problems is minimizing wire ...
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其他好文 时间:
2014-08-18 00:20:23
阅读次数:
331
Follow up for "Unique Paths":
Now consider if some obstacles are added to the grids. How many unique paths would there be?...
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其他好文 时间:
2014-08-17 15:39:42
阅读次数:
221
用以下代码打开沙盒目录 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);打印paths得到沙盒目录如下/Users/ocq/Library/Develo....
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其他好文 时间:
2014-08-17 01:02:51
阅读次数:
270
Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.For example:Given the below binary tree and sum ...
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其他好文 时间:
2014-08-16 22:24:21
阅读次数:
212
Description
Optimal Symmetric Paths
You have a grid of n rows and
n columns. Each of the unit squares contains a non-zero digit. You walk from the top-left square to the b...
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其他好文 时间:
2014-08-16 12:36:50
阅读次数:
332
Slash MazeBy filling a rectangle with slashes (/) and backslashes ( ), you can generate nice little mazes. Here is an example:As you can see, paths i....
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其他好文 时间:
2014-08-15 14:30:58
阅读次数:
272