# Build python3.8 on centos
###### tags: `c4lab`
Python3.8.5 are used in this tutorial

## Download Python 3.8
Download lastest source from https://www.python.org/downloads/source/

wget https://www.python.org/ftp/python/3.8.5/Python-3.8.5.tar.xz
tar xf Python-3.8.5.tar.xz
cd Python-3.8.5

## Install Necessary packages

sudo yum install openssl-devel sqlite-devel libffi-devel cairo-devel tk-devel

* `openssl-devel` is necessary for `pip install`
* `libffi-devel` is for `ctype`
* `sqlite-devel` is for `sqlite3`
* `tk-devel` is for X11 env.

If gcc version is too old

$ sudo yum install devtoolset-9
$ scl enable devtoolset-9 bash

## Run and Install

mkdir build
cd build
../configure --prefix=$HOME/env/python3.8 --enable-optimizations --enable-loadable-sqlite-extensions
make -j 16
make install -j 16

## Setup Environment

cd $HOME
env/python3.8/bin/python3 -m venv env
source $HOME/env/bin/activate

And you can set alias in `~/.bashrc`
`alias pyenv="source $HOME/env/bin/activate"`

## Try

pip install jupyterlab ipython matplotlib
ipython
import matplotlib.pyplot as plt
plt.plot([1,2,3])
plt.show()