Installing Python3.8

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.8
sudo apt-get install python3.8-distutils

Install python3.8 venv

 python3.8 -m pip install --user virtualenv
 sudo apt-get install python3.8-venv
 python3.8 -m venv env

python 3.7 venv

python3.7 -m venv env

setup python3 binary

sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2

sudo update-alternatives --config python3

install the pip3

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3 get-pip.py

References

• https://docs.python-guide.org/starting/install3/linux/
• https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/

pip generate requirement.txt

pip3 freeze > requirements.txt