Managing Multiple Versions of Python on Ubuntu 20.04

Managing Multiple Versions of Python on Ubuntu

# Managing Multiple Versions of Python on Ubuntu 20.04
sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev
sudo apt-get install build-essential checkinstall
sudo apt autoremove
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
sudo apt-get install build-essential checkinstall
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev \
    libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
cd /opt
sudo wget https://www.python.org/ftp/python/3.9.2/Python-3.9.2.tgz
sudo tar xzf Python-3.9.2.tgz
cd Python-3.9.2
sudo ./configure --enable-optimizations
sudo make altinstall
cd /usr/local/bin/
ls
    update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1
update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.9 2
update-alternatives --list python3
update-alternatives --config python3

sudo apt-get install python3-pip

sudo nano ~/.bashrc
# Add into the bottom 
alias python=python3
alias pip=pip3

# Save & Exit ctrl+s and ctrl+x

alias python=python3
alias pip=pip3

source ~/.bashrc
sudo apt update -y
sudo apt upgrade -y
python3 --version
python --version
pip3 --version
pip --version