Centos 7安装python3

[root@localhost /]# cd /
[root@localhost /]#

[root@localhost bin]# cd /usr/bin
[root@localhost bin]# ls python*
python  python2  python2.7 
[root@localhost bin]#

[root@localhost bin]# mv python python.bak

[root@localhost bin]# mkdir /usr/local/python3   (此处根据网友评论指出，已改正)

[root@localhost bin]# cd /usr/local/python3
[root@localhost python3]# ll
total 0
[root@localhost python3]#

[root@localhost python3]# wget https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz

#解压命令
[root@localhost python3]# tar -xvf Python-3.6.3.tgz

#解压完成后，查看目录下文件
[root@localhost python3]# ll
total 22148
drwxr-xr-x. 17  501  501     4096 Oct 21 12:22 Python-3.6.3
-rw-r--r--.  1 root root 22673115 Oct  3 15:47 Python-3.6.3.tgz

[root@localhost python3]# cd Python-3.6.3/
[root@localhost Python-3.6.3]#

[root@localhost Python-3.6.3]# ./configure --prefix=/usr/local/python3Dir

[root@localhost Python-3.6.3]# make

[root@localhost Python-3.6.3]# make install

[root@localhost Python-3.6.3]# cd /usr/local/python3Dir/
[root@localhost python3Dir]# ll
total 0
drwxr-xr-x. 2 root root 245 Oct 21 12:26 bin
drwxr-xr-x. 3 root root  24 Oct 21 12:26 include
drwxr-xr-x. 4 root root  63 Oct 21 12:26 lib
drwxr-xr-x. 3 root root  17 Oct 21 12:26 share
[root@localhost python3Dir]#

[root@localhost python3Dir]# cd /usr/bin
#然后输入以下命令 ，创建一个软链接
[root@localhost bin]# ln -s /usr/local/python3Dir/bin/python3 /usr/bin/python

[root@localhost bin]# vi /usr/bin/yum

[root@localhost bin]# ll -a python*
lrwxrwxrwx. 1 root root   33 Oct 21 12:30 python -> /usr/local/python3Dir/bin/python3
lrwxrwxrwx. 1 root root    9 Oct 19 23:55 python2 -> python2.7
-rwxr-xr-x. 1 root root 7136 Aug  4 08:40 python2.7
lrwxrwxrwx. 1 root root    7 Oct 19 23:55 python.bak -> python2
[root@localhost bin]#

[root@localhost bin]# python -V
Python 3.6.3
[root@localhost bin]#

[root@localhost bin]# python
Python 3.6.3 (default, Oct 21 2017, 12:21:40) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> print("Hello World")
Hello World
>>> exit()
[root@localhost bin]#