python2.7 之centos7 安装 pip， Scrapy-白红宇

一、确定python版本在2.7及以上

强烈建议升级python2.7后再安装pip与setuptools,如果不这样操作会出现很多莫明的问题，让你酸爽到天明！！

如果你是升级到python2.7，更大的可能性是全部通过python setup.py 编译安装，所需要的包含但不限于这些包

lxml,zope.interface,Twisted,characteristic,pyasn1-modules,service-identity,Scrapy

PS:我一开始就是编译安装的，其中最多的问题是:

error:

command

'gcc'

failed with

exit

status 1

后来我发现，如果有这样的提示不是缺少devel包就是少某一个lib库文件;最令我哭笑不得是安装Scrapy 提示成功，但无法创建项目，测试样例都跑不了，最终我果断的换centos7了！

###################以下内容都是Centos 7上的操作，升级到python2.7的同学请绕行##############

二、确定安装了yum的epel最新库

三、如果系统中安装有audit这个包请先移除，它会影响到Scrapy的安装

#yum remove audit

四、安装Scarpy 所需要的开发包

#yum install -y python-devel gcc libffi-devel openssl-devel libxslt-devel libxml2-devel

五、安装pip与setuptools

                
#yum install python-pip -y
#pip install  setuptools
#pip install setuptools --upgrade

六、安装Scrapy

                
# pip install Scrapy
Collecting Scrapy
  
Using cached Scrapy-1.0.3-py2-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): cssselect>=0.9 
in
/usr/lib/python2
.7
/site-packages
(from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): queuelib 
in
/usr/lib/python2
.7
/site-packages
(from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): pyOpenSSL 
in
/usr/lib/python2
.7
/site-packages
(from Scrapy)
Requirement already satisfied (use --upgrade to upgrade): w3lib>=1.8.0 
in
/usr/lib/python2
.7
/site-packages
(from Scrapy)
Collecting lxml (from Scrapy)
  
Using cached lxml-3.4.4.
tar
.gz
Collecting Twisted>=10.0.0 (from Scrapy)
  
Using cached Twisted-15.4.0.
tar
.bz2
Requirement already satisfied (use --upgrade to upgrade): six>=1.5.2 
in
/usr/lib/python2
.7
/site-packages
(from Scrapy)
Collecting service-identity (from Scrapy)
  
Using cached service_identity-14.0.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): cryptography>=0.7 
in
/usr/lib64/python2
.7
/site-packages
(from pyOpenSSL->Scrapy)
Collecting zope.interface>=3.6.0 (from Twisted>=10.0.0->Scrapy)
  
Using cached zope.interface-4.1.3.
tar
.gz
Collecting characteristic>=14.0.0 (from service-identity->Scrapy)
  
Using cached characteristic-14.3.0-py2.py3-none-any.whl
Collecting pyasn1-modules (from service-identity->Scrapy)
  
Using cached pyasn1_modules-0.0.8-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): pyasn1 
in
/usr/lib/python2
.7
/site-packages
(from service-identity->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): idna>=2.0 
in
/usr/lib/python2
.7
/site-packages
(from cryptography>=0.7->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): setuptools 
in
/usr/lib/python2
.7
/site-packages
(from cryptography>=0.7->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): enum34 
in
/usr/lib/python2
.7
/site-packages
(from cryptography>=0.7->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): ipaddress 
in
/usr/lib/python2
.7
/site-packages
(from cryptography>=0.7->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): cffi>=1.1.0 
in
/usr/lib64/python2
.7
/site-packages
(from cryptography>=0.7->pyOpenSSL->Scrapy)
Requirement already satisfied (use --upgrade to upgrade): pycparser 
in
/usr/lib/python2
.7
/site-packages
(from cffi>=1.1.0->cryptography>=0.7->pyOpenSSL->Scrapy)
Installing collected packages: lxml, zope.interface, Twisted, characteristic, pyasn1-modules, service-identity, Scrapy
  
Running setup.py 
install
for
lxml
  
Running setup.py 
install
for
zope.interface
  
Running setup.py 
install
for
Twisted
Successfully installed Scrapy-1.0.3 Twisted-15.4.0 characteristic-14.3.0 lxml-3.4.4 pyasn1-modules-0.0.8 service-identity-14.0.0 zope.interface-4.1.3
        
      

七、创建项目

                          
[root@localhost workspace]
# scrapy startproject tutorial
2015-10-15 21:54:24 [scrapy] INFO: Scrapy 1.0.3 started (bot: scrapybot)
2015-10-15 21:54:24 [scrapy] INFO: Optional features available: ssl, http11
2015-10-15 21:54:24 [scrapy] INFO: Overridden settings: {}
New Scrapy project 
'tutorial'
created 
in
:
    
/workspace/tutorial
You can start your first spider with:
    
cd
tutorial
    
scrapy genspider example example.com
        
      

八、目录结构

                          
[root@localhost workspace]
# tree
.
└── tutorial
    
├── scrapy.cfg
    
└── tutorial
        
├── __init__.py
        
├── items.py
        
├── pipelines.py
        
├── settings.py
        
└── spiders
            
└── __init__.py
3 directories, 6 files