xpath scrapy shell
https://docs.djangoproject.com/en/2.2/ref/contrib/
contrib
packages
Django aims to follow Python’s “batteries included” philosophy. It ships with a variety of extra, optional tools that solve common Web-development problems.
This code lives in django/contrib
in the Django distribution. This document gives a rundown of the packages in contrib
, along with any dependencies those packages have.
https://docs.python.org/3/tutorial/stdlib.html#tut-batteries-included
10.12. Batteries Included
Python has a “batteries included” philosophy. This is best seen through the sophisticated and robust capabilities of its larger packages. For example:
The
xmlrpc.client
andxmlrpc.server
modules make implementing remote procedure calls into an almost trivial task. Despite the modules names, no direct knowledge or handling of XML is needed.The
email
package is a library for managing email messages, including MIME and other RFC 2822-based message documents. Unlikesmtplib
andpoplib
which actually send and receive messages, the email package has a complete toolset for building or decoding complex message structures (including attachments) and for implementing internet encoding and header protocols.The
json
package provides robust support for parsing this popular data interchange format. Thecsv
module supports direct reading and writing of files in Comma-Separated Value format, commonly supported by databases and spreadsheets. XML processing is supported by thexml.etree.ElementTree
,xml.dom
andxml.sax
packages. Together, these modules and packages greatly simplify data interchange between Python applications and other tools.The
sqlite3
module is a wrapper for the SQLite database library, providing a persistent database that can be updated and accessed using slightly nonstandard SQL syntax.Internationalization is supported by a number of modules including
gettext
,locale
, and thecodecs
package.
xpath scrapy shell的更多相关文章
- 安装ipython,使用scrapy shell来验证xpath选择的结果 | How to install iPython and how does it work with Scrapy Shell
1. scrapy shell 是scrapy包的一个很好的交互性工具,目前我使用它主要用于验证xpath选择的结果.安装好了scrapy之后,就能够直接在cmd上操作scrapy shell了. 具 ...
- python爬虫scrapy之scrapy终端(Scrapy shell)
Scrapy终端是一个交互终端,供您在未启动spider的情况下尝试及调试您的爬取代码. 其本意是用来测试提取数据的代码,不过您可以将其作为正常的Python终端,在上面测试任何的Python代码. ...
- Scrapy Shell的使用
Scrapy终端是一个交互终端,我们可以在未启动spider的情况下尝试及调试代码,也可以用来测试XPath或CSS表达式,查看他们的工作方式,方便我们爬取的网页中提取的数据. 如果安装了 IPyth ...
- 14.Scrapy Shell
Scrapy终端是一个交互终端,我们可以在未启动spider的情况下尝试及调试代码,也可以用来测试XPath或CSS表达式,查看他们的工作方式,方便我们爬取的网页中提取的数据. 如果安装了 IPyth ...
- scrapy shell
一.scrapy shell 1.安装pip install Jupyter 2.在pycharm中的启动命令: scrapy shell 注:启动后关键字高亮显示 3.查看response 执行sc ...
- 在Scrapy项目【内外】使用scrapy shell命令抓取 某网站首页的初步情况
Windows 10家庭中文版,Python 3.6.3,Scrapy 1.5.0, 时隔一月,再次玩Scrapy项目,希望这次可以玩的更进一步. 本文展示使用在 Scrapy项目内.项目外scrap ...
- scrapy框架系列 (4) Scrapy Shell
Scrapy Shell Scrapy终端是一个交互终端,我们可以在未启动spider的情况下尝试及调试代码,也可以用来测试XPath或CSS表达式,查看他们的工作方式,方便我们爬取的网页中提取的数据 ...
- scrapy shell命令的【选项】简介
在使用scrapy shell测试某网站时,其返回400 Bad Request,那么,更改User-Agent请求头信息再试. DEBUG: Crawled () <GET https://w ...
- scrapy shell 用法(慢慢更新...)
scrapy shell 命令 1.scrapy shell url #url指你所需要爬的网址 2.有些网址数据的爬取需要user-agent,scrapy shell中可以直接添加头文件, 第①种 ...
随机推荐
- db2 连接报错connect。 ERRORCODE=-4499, SQLSTATE=08001(转载)
在使用data studio连接远程DB2数据库时报错如下: [jcc][Thread:main][SQLException@5b775b77] java.sql.SQLException [jcc] ...
- 关于Context
Context字面意思是上下文,位于framework package的android.content.Context中,其实该类为LONG型,类似Win32中的Handle句柄.很多方法需要通过 C ...
- phan—php语法静态检查在windows下的配置
php7推出了语法树,于是静态语法分析更方便了.(可以直接下载我配置好的,传送门百度网盘) 1.先安装php7,到http://windows.php.net/下载php7带openssl的. 2.修 ...
- Unix系统编程()发送信号kill
与shell的kill命令类似,一个进程能够使用kill系统调用向另一进程发送信号. 之所以选择kill作为术语,因为早期UNIX实现中大多数信号的默认行为是终止进程. #include <si ...
- Linux系统编程--read/write
. read/write read函数从打开的设备或文件中读取数据. #include <unistd.h> ssize_t read(int fd, void *buf, size_t ...
- PHP——投票
要求: 选择第一个页面的复选框值,点击提交则提交数据,点击查看结果在同一页面覆盖显示结果的投票人数,百分比和进度条,点击返回,返回第一页面 数据库为 投票 表格为diaoyanxx 表格内容为: zh ...
- ansible IP
问题解决了,用IP: "{{ ansible_eth0'ipv4' }}" 而不是{{ansible_all_ipv4_addresses}} 修改了之后的playbook 如下: ...
- Discretized Streams, 离散化的流数据处理
Discretized Streams: An Efficient and Fault-Tolerant Model for Stream Processing on Large Clusters ...
- 360 奇酷行车记录仪12967p 安霸a7
http://www.qikoo.com/che?utm_source=xingchejiluyi_360daohang_xialareci_0528&utm_medium=inside ht ...
- OAuth认证协议原理分析及同步消息到Twitter和Facebook使用方法
OAuth有什么用?为什么要使用OAuth? twitter或豆瓣用户一定会发现,有时候,在别的网站,点登录后转到 twitter登录,之后转回原网站,你会发现你已经登录此网站了,这种网站就是这个效果 ...