CentOS下安裝python3.5+scrapy

前言：不用改掉系統python2.7 ，原來是python2.7，咱們還進行python2.7的保留

1.編譯前準備其餘庫的安裝(使用sudo命令)

[root@hadron ~]# yum -y groupinstall "Development tools" 

[root@hadron ~]# yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

2.下載python3安裝壓縮包->解壓->進入目錄->編譯->安裝

[root@hadron ~]#  wget https://www.python.org/ftp/python/3.5.5/Python-3.5.5.tgz
[root@hadron ~]# tar -zxvf Python-3.5.5.tgz 
[root@hadron ~]# cd Python-3.5.5/
[**加粗文字**root@hadron ~]#  ./configure --prefix=/usr/local/python3
[root@hadron ~]#  make && make install

3.建立Python3，pip3的軟連接

[root@hadron ~]#  ln -s /usr/local/python3/bin/python3 /usr/bin/python3
[root@hadron ~]#  ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

4.驗證Python3 和pip3 是否安裝成功

[root@hadron ~]# python
Python 2.7.5 (default, Nov  6 2016, 00:28:07) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()
[root@hadron ~]# python3
Python 3.5.5 (default, Feb 27 2018, 09:28:49) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> quit()
[root@hadron ~]# 

[root@hadron ~]#  pip3 --version
pip 9.0.1 from /usr/local/python3/lib/python3.5/site-packages (python 3.5)

5.安裝Scrapy爬蟲框架

安裝過程當中若是出現紅色代碼，多是網絡緣由，請試多幾回

[root@hadron ~]# pip3 install scrapy

6. 驗證是否安裝成功

[root@hadron ~]# python3
[root@hadron ~]# >>>import scrapy
[root@hadron ~]# >>>

上面也是驗證Scrapy框架安裝成功，由於咱們進行了import scrapy沒有進行報錯。

7.建立Scrapy軟連接

[root@hadron ~]# ln -s /usr/local/python3/bin/scrapy  /usr/bin/scrapy

8. 驗證Scrapy軟連接

[root@hadron ~]#  scrapy -v
Scrapy 1.5.0 - no active project