Install Python 3

sudo apt update

sudo apt install python3

Configure python3 as default interpreter

# configure an alias
echo "alias python=python3" >> ~/.bash_aliases

# updated information
source ~/.bash_aliases

# show version
python --version
Python 3.7.5

Configure pip3

#install latest version of PIP for Python3
sudo apt install python3-pip

# configure an alias
echo "alias pip=pip3" >> ~/.bash_aliases

# updated information
source ~/.bash_aliases

pip --version
pip 18.1 from /usr/lib/python3/dist-packages/pip (python 3.7)