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Centos7下不删除python2.x的情况下安装python3.x
Linux下默认系统自带python2.X的版本，这个版本被系统很多程序所依赖，所以不建议删除，如果使用最新的Python3那么我们知道编译安装源码包和系统默认包之间是没有任何影响的，所以可以安装python3和python2共存
1、下载linux平台的python3.x的安装包(我下载的是python3.6版本)
[root@localhost ~]# wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz
2、解压python3.6安装包
[root@localhost ~]# tar xf Python-3.6.1.tgz [root@localhost ~]# ll total 22024 -rw-------. 1 root root 1238 Jun 25 10:54 anaconda-ks.cfg drwxr-xr-x. 17 501 501 4096 Mar 21 03:47 Python-3.6.1 -rw-r--r--. 1 root root 22540566 Mar 21 03:47 Python-3.6.1.tgz
3、安装python3.6，默认安装路径为/usr/local
--prefix=PREFIX install architecture-independent files in PREFIX
[/usr/local]
#安装报错，缺失依赖库 [root@localhost Python-3.6.1]# ./configure checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking for python3.6... no checking for python3... no checking for python... python checking for --enable-universalsdk... no checking for --with-universal-archs... no checking MACHDEP... linux checking for --without-gcc... no checking for --with-icc... no checking for gcc... no checking for cc... no checking for cl.exe... no configure: error: in `/root/Python-3.6.1‘: configure: error: no acceptable C compiler found in $PATH See `config.log‘ for more details #安装依赖库 [root@localhost Python-3.6.1]# yum install gcc #安装python3.6 [root@localhost Python-3.6.1]# make && make install #make && make install 报错 zipimport.ZipImportError: can‘t decompress data; zlib not available make: *** [install] Error 1 #安装zlib-devel [root@localhost Python-3.6.1]# yum install zlib-devel
4、python3.6已安装成功，在/usr/local下生成命令python3
[root@localhost local]# ll /usr/local/bin/ total 24656 lrwxrwxrwx. 1 root root 8 Jun 25 11:22 2to3 -> 2to3-3.6 -rwxr-xr-x. 1 root root 101 Jun 25 11:22 2to3-3.6 -rwxr-xr-x. 1 root root 242 Jun 25 11:22 easy_install-3.6 lrwxrwxrwx. 1 root root 7 Jun 25 11:22 idle3 -> idle3.6 -rwxr-xr-x. 1 root root 99 Jun 25 11:22 idle3.6 -rwxr-xr-x. 1 root root 214 Jun 25 11:22 pip3 -rwxr-xr-x. 1 root root 214 Jun 25 11:22 pip3.6 lrwxrwxrwx. 1 root root 8 Jun 25 11:22 pydoc3 -> pydoc3.6 -rwxr-xr-x. 1 root root 84 Jun 25 11:22 pydoc3.6 lrwxrwxrwx. 1 root root 9 Jun 25 11:22 python3 -> python3.6 -rwxr-xr-x. 2 root root 12604536 Jun 25 11:21 python3.6 lrwxrwxrwx. 1 root root 17 Jun 25 11:22 python3.6-config -> python3.6m-config -rwxr-xr-x. 2 root root 12604536 Jun 25 11:21 python3.6m -rwxr-xr-x. 1 root root 3097 Jun 25 11:22 python3.6m-config lrwxrwxrwx. 1 root root 16 Jun 25 11:22 python3-config -> python3.6-config lrwxrwxrwx. 1 root root 10 Jun 25 11:22 pyvenv -> pyvenv-3.6 -rwxr-xr-x. 1 root root 441 Jun 25 11:22 pyvenv-3.6
5、使用python3命令查看版本
[root@localhost local]# python3 -V Python 3.6.1 [root@localhost local]# python3 Python 3.6.1 (default, Jun 25 2017, 11:20:12) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux Type "help", "copyright", "credits" or "license" for more information.
参考：http://www.cnblogs.com/freeweb/p/5181764.html
Centos7下不删除python2.x的情况下安装python3.x
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