前面豆子學習了基本的urllib的模塊，通過這個模塊可以寫一些簡單的爬蟲文件。如果要處理大中型的爬蟲項目，urllib就顯得比較low了，這個時候可以使用scrapy框架來實現，很多基本的處理在scrapy里面已經做好了。

首先來安裝一下。推薦的流程如下：

1. 首先升級一下pip

C:\WINDOWS\system32>python -m pip install --upgrade pip
Requirement already up-to-date: pip in c:\python36\lib\site-packages

2. 安裝wheel

   C:\WINDOWS\system32>pip install wheel
   Requirement already satisfied: wheel in c:\python36\lib\site-packages

3.安裝lxml

C:\WINDOWS\system32>pip install lxml
Collecting lxmlDownloading lxml-4.1.1-cp36-cp36m-win32.whl (3.2MB)100% |████████████████████████████████| 3.2MB 307kB/s
Installing collected packages: lxml
Successfully installed lxml-4.1.1

4. 安裝twisted（如果在線安裝報錯的話，可以考慮離線安裝）
   從https://www.lfd.uci.edu 上搜索twisted, 可以看見他有很多個版本

執行一下python命令看看當前的版本，可以看見我的版本是3.6.2,32位的

c:\Users\yuan.li\Downloads>python
Python 3.6.2 (v3.6.2:5fd33b5, Jul  8 2017, 04:14:34) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

這樣的話可以下載對應的版本twisted-17.9.0-cp36-win32.whl就行了。
下載之后，手動安裝

c:\Users\yuan.li\Downloads>pip install Twisted-17.9.0-cp36-cp36m-win32.whl
Processing c:\users\yuan.li\downloads\twisted-17.9.0-cp36-cp36m-win32.whl
Requirement already satisfied: incremental>=16.10.1 in c:\python36\lib\site-packages (from Twisted==17.9.0)
Requirement already satisfied: Automat>=0.3.0 in c:\python36\lib\site-packages (from Twisted==17.9.0)
Requirement already satisfied: zope.interface>=4.0.2 in c:\python36\lib\site-packages (from Twisted==17.9.0)
Requirement already satisfied: hyperlink>=17.1.1 in c:\python36\lib\site-packages (from Twisted==17.9.0)
Requirement already satisfied: constantly>=15.1 in c:\python36\lib\site-packages (from Twisted==17.9.0)
Requirement already satisfied: six in c:\python36\lib\site-packages (from Automat>=0.3.0->Twisted==17.9.0)
Requirement already satisfied: attrs in c:\python36\lib\site-packages (from Automat>=0.3.0->Twisted==17.9.0)
Requirement already satisfied: setuptools in c:\python36\lib\site-packages (from zope.interface>=4.0.2->Twisted==17.9.0)
Installing collected packages: Twisted
Successfully installed Twisted-17.9.0

5. 最后安裝scrapy

c:\Users\yuan.li\Downloads>pip install scrapy
Collecting scrapyDownloading Scrapy-1.5.0-py2.py3-none-any.whl (251kB)100% |████████████████████████████████| 256kB 2.3MB/s
Collecting pyOpenSSL (from scrapy)Downloading pyOpenSSL-17.5.0-py2.py3-none-any.whl (53kB)100% |████████████████████████████████| 61kB 4.5MB/s
Collecting cssselect>=0.9 (from scrapy)Downloading cssselect-1.0.3-py2.py3-none-any.whl
Collecting parsel>=1.1 (from scrapy)

安裝完成之后，執行一下scrapy, 看看是否工作

c:\Users\yuan.li\Downloads>scrapy
Scrapy 1.5.0 - no active projectUsage:scrapy <command> [options] [args]Available commands:bench         Run quick benchmark testfetch         Fetch a URL using the Scrapy downloadergenspider     Generate new spider using pre-defined templatesrunspider     Run a self-contained spider (without creating a project)settings      Get settings valuesshell         Interactive scraping consolestartproject  Create new projectversion       Print Scrapy versionview          Open URL in browser, as seen by Scrapy[ more ]      More commands available when run from project directory