前言：不用改掉系统python2.7 ，原来是python2.7，我们还进行python2.7的保留
1.编译前准备其他库的安装(使用sudo命令)
代码语言：javascript复制[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-devel2.下载python3安装压缩包->解压->进入目录->编译->安装
代码语言：javascript复制[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 install3.创建Python3，pip3的软链接
代码语言：javascript复制[root@hadron ~]# ln -s /usr/local/python3/bin/python3 /usr/bin/python3
[root@hadron ~]# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip34.验证Python3 和pip3 是否安装成功
代码语言：javascript复制[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.安装Scrapy爬虫框架
代码语言：javascript复制安装过程中如果出现红色代码，可能是网络原因，请试多几次[root@hadron ~]# pip3 install scrapy6. 验证是否安装成功
代码语言：javascript复制[root@hadron ~]# python3
[root@hadron ~]# >>>import scrapy
[root@hadron ~]# >>>上面也是验证Scrapy框架安装成功，因为我们进行了import scrapy没有进行报错。
7.创建Scrapy软链接
代码语言：javascript复制 [root@hadron ~]# ln -s /usr/local/python3/bin/scrapy /usr/bin/scrapy8. 验证Scrapy软链接
代码语言：javascript复制[root@hadron ~]# scrapy -v
Scrapy 1.5.0 - no active project
