lxml

学习笔记 网络爬虫篇之 [数据清洗]

由 寵の児 提交于 2020-02-27 18:19:48
文章目录 一、XPath语法和lxml模块 1.Xpath语法 1.1 什么是XPath？ 1.2 XPath开发工具 1.3 XPath语法 选取摘要： 谓语： 通配符 选择多个路径： 二、lxml库 1、基本使用： 2、在lxml中使用XPath语法： 2.1 获取所有li标签： 2.2 获取所有li元素下的所有类属性的值： 2.3 获取li标签下href为www.baidu.com的a标签： 2.4 获取li标签下所有span标签： 2.5 获取li标签下的a标签里的所有类别： 2.6 获取最后一个li的a的href属性对应的值： 2.7获取倒数第二个li元素的内容： 2.8 获取倒数第二个li元素的内容的第二种方式： 使用requests和xpath爬取电影天堂 三、BeautifulSoup4库 1、`BeautifulSoup4`库 2、几大解析工具对比： 2.1 简单使用： 2.2 四个常用的对象： 2.2.1 Tag： 2.2.2 NavigableString： 2.2.3 BeautifulSoup： 2.2.4 Comment： 3.遍历文档树： 3.1 contents和children： 3.2 strings 和 stripped_strings 4.搜索文档树： 4.1 find和find_all方法： 4.2 select方法： 四

如何在Ubuntu上安装lxml

由 南笙酒味 提交于 2020-02-27 09:55:32
我在Ubuntu 11上使用easy_install安装lxml时遇到了困难。 当我输入 $ easy_install lxml 我得到： Searching for lxml Reading http://pypi.python.org/simple/lxml/ Reading http://codespeak.net/lxml Best match: lxml 2.3 Downloading http://lxml.de/files/lxml-2.3.tgz Processing lxml-2.3.tgz Running lxml-2.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7UdQOZ/lxml-2.3/egg-dist-tmp-GacQGy Building lxml version 2.3. Building without Cython. ERROR: /bin/sh: xslt-config: not found ** make sure the development packages of libxml2 and libxslt are installed ** Using build configuration of libxslt In file included from src/lxml

How to get multiple errors validating XML file with Python libraries?

由 走远了吗. 提交于 2020-02-27 03:53:12
问题 I have some XML file i want to validate and i have to do it with Python. I've tryed to validate it with XSD with lxml. But i get only one error which occurs first but i need all errors and mismatches in XML file. Is there any method how i can manage to get list of all errors with lxml? Or are there any other Python solutions? 回答1: The way to solve this problem was: try: xmlschema.assertValid(xml_to_validate) except etree.DocumentInvalid, xml_errors: pass print "List of errors:\r\n", xml

How can I install lxml in docker

由 别等时光非礼了梦想. 提交于 2020-02-26 08:51:04
问题 I want to deploy my python project in docker, I wrote lxml>=3.5.0 in the requirments.txt as the project needs lxml. Here is my dockfile: FROM gliderlabs/alpine:3.3 RUN set -x \ && buildDeps='\ python-dev \ py-pip \ build-base \ ' \ && apk --update add python py-lxml $buildDeps \ && rm -rf /var/cache/apk/* \ && mkdir -p /app ENV INSTALL_PATH /app WORKDIR $INSTALL_PATH COPY requirements-docker.txt ./ RUN pip install -r requirements.txt COPY . . RUN apk del --purge $buildDeps ENTRYPOINT ["celery

How can I install lxml in docker

由 与世无争的帅哥 提交于 2020-02-26 08:50:06
问题 I want to deploy my python project in docker, I wrote lxml>=3.5.0 in the requirments.txt as the project needs lxml. Here is my dockfile: FROM gliderlabs/alpine:3.3 RUN set -x \ && buildDeps='\ python-dev \ py-pip \ build-base \ ' \ && apk --update add python py-lxml $buildDeps \ && rm -rf /var/cache/apk/* \ && mkdir -p /app ENV INSTALL_PATH /app WORKDIR $INSTALL_PATH COPY requirements-docker.txt ./ RUN pip install -r requirements.txt COPY . . RUN apk del --purge $buildDeps ENTRYPOINT ["celery

Finding parent from child in XML using python

由 依然范特西╮ 提交于 2020-02-22 06:01:27
问题 I'm new to this, so please be patient. Using ETree and Python 2.7, I'm trying to parse a large XML file that I did not generate. Basically, the file contains groups of voxels contained in a large volume. The general format is: <things> <parameters> <various parameters> </parameters> <thing id="1" comment="thing1"> <nodes> <node id="1" x="1" y="1" z="1"/> <node id="2" x="2" y="2" z="2"/> </nodes> <edges> <edge source="1" target="2"/> </edges> </thing> <thing id="N" comment="thingN"> <nodes>

Finding parent from child in XML using python

由 不想你离开。 提交于 2020-02-22 06:01:07
问题 I'm new to this, so please be patient. Using ETree and Python 2.7, I'm trying to parse a large XML file that I did not generate. Basically, the file contains groups of voxels contained in a large volume. The general format is: <things> <parameters> <various parameters> </parameters> <thing id="1" comment="thing1"> <nodes> <node id="1" x="1" y="1" z="1"/> <node id="2" x="2" y="2" z="2"/> </nodes> <edges> <edge source="1" target="2"/> </edges> </thing> <thing id="N" comment="thingN"> <nodes>

Could not find a version that satisfies the requirement lxml解决方法

由 穿精又带淫゛_ 提交于 2020-02-19 19:23:14
今天ytkah在安装lxml时提示错误ERROR: Could not find a version that satisfies the requirement lxml (from versions: none)，ERROR: No matching distribution found for lxml，升级一下pip试试 python -m pip install --upgrade pip 　　再次安装lxml还是错误，考虑到是网络不稳定的问题，这时我们用国内的镜像源来加速 pip install 包名-i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com 　　--trusted-host pypi.douban.com 这是为了获得ssl证书的认证 执行成功！ 不过每次这样手动输入会比较麻烦,建议每次换系统时先换成国内的镜像源，具体配置请参考https://blog.csdn.net/u012592062/article/details/51966649 来源： https://www.cnblogs.com/ytkah/p/12332265.html

Python Scrapy环境配置教程+使用Scrapy爬取李毅吧内容

由 末鹿安然 提交于 2020-02-17 07:56:32
Python爬虫框架Scrapy Scrapy框架 1、Scrapy框架安装 直接通过这里安装scrapy会提示报错： error: Microsoft Visual C++ 14.0 is required <Unable to find vcvarsall.bat> building 'twisted test.raiser' extension error:Unable to find cyarsall.bat Failed building wheel for lxml 解决方法： 在 http://www.lfd.uci.edu/~gohlke/pythonlibs/ 有很多用于windows的编译好的Python第三方库，我们下载好对应自己Python版本的库即可。 在cmd中输入指令python，查看python的版本，如下： 从上图可以看出可以看出我的Python版本为Python3.7.1-64bit。 登陆http://www.lfd.uci.edu/~gohlke/pythonlibs/，Ctrl+F搜索Lxml、Twisted、Scrapy，下载对应的版本，例如：lxml-3.7.3-cp35-cp35m-win_adm64.whl，表示lxml的版本为3.7.3，对应的python版本为3.5-64bit。我下载的版本如下图所示： 在cmd中输入DOS指令

lxml XMLSyntaxError: Namespace default prefix was not found

由 左心房为你撑大大i 提交于 2020-02-16 07:25:22
问题 I am using lxml to read my xml file. I am using a code something like below. It works just fine with lxml2.3 beta1, but with lxml2.3 it gives me zn xml syntax error as shown below. I went through the release notes for both versions, but could not figure out what could have caused this error or how to fix it. Please help if you have come across such a thing or have any clues about it. Thanks!! Code: from lxml import etree def parseXml(context,attribList,elemList): for event, element in context
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