1/Set up wget by http/https proxy:
Add below lines to /etc/wgetrc::
http_proxy = http://IP Proxy>:<Port>
https_proxy = http://<IP Proxy>:<Port>
2/Export http_proxy and https_proxy env:
export http_proxy=http://IP Proxy>:<Port>
export https_proxy=http://IP Proxy>:<Port>
3/Download source and install python 3.8.2:
wget https://www.python.org/ftp/python/3.8.2/Python-3.8.2.tgz
tar -xzvf Python-3.8.2.tgz
cd Python-3.8.2
./configure --enable-optimizations make altinstall
-Relink python in /usr/bin/python
cd /usr/bin/
ln -sf /usr/local/bin/python3.8 python
-Recheck version after re-link python:
python -V