OS:rhel7
soft:Python-3.6.10.tgz

]# yum install -y gcc gcc-c++ zlib-devel openssl-devel readline-devel \
libffi-devel sqlite-devel tcl-devel tk-devel

]# tar -zxvf Python-3.6.10.tgz 

]# cd Python-3.6.10/

]# ./configure --prefix=/usr/local/
]# make
]# make install


[root@host51 ~]# python
Python 2.7.5 (default, Apr 11 2018, 07:36:10) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
root@host51 ~]# 

[root@host51 ~]# python3
Python 3.6.10 (default, May 12 2021, 13:01:33) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
[root@host51 ~]#