Install Python

using https://github.com/pyenv/pyenv

Great tool !

• install it linux/unix, windows, mac
• satisfy prerequisites

# Let's install new version
$ pyenv install 3.7.3
# Let's activate version for the current directory ~/project
$ cd ~/project
$ pyenv local 3.7.3
# check version:
$ python --version
Python 3.7.3

From source on ubuntu linux

• https://docs.python.org/3/using/unix.html#building-python

1. download XZ sources from python.org
2. tar xpf Python-3.7.3.tar.xz
3. sudo apt-get install libffi-dev zlib1g-dev
4. ./configure
5. make && sudo make altinstall