install_python3

#! /bin/bash
#
# Install a python from source - courtesy Felix Stoehr - for casa6
#
# using pip for package management (conda does not seem to be needed for our purposes)
#
#  note:
#  - Python vs. python 
#
# Dependencies:
#   on ubuntu-20 you will need at least:  libssl-dev libsqlite3-dev
#                maybe also: libreadline-gplv2-dev libncursesw5-dev tk-dev libgdbm-dev libc6-dev libbz2-dev
#   on centos:   zlib-devel openssl-devel sqlite-devel
#   versions on feb 15-19, 2021         3.9.2    3.8.8    3.7.10   3.6.13
             
INSTALLOCATION=$PWD
version=3.8.8
wget=wget

# key=val COMMAND LINE PARSING
for arg in $*; do
  export $arg
done


# PYTHON
if [ ! -f Python-$version.tgz ]; then
    $wget https://www.python.org/ftp/python/$version/Python-$version.tgz
fi
tar -xzvf Python-$version.tgz
cd Python-$version

prefix=$INSTALLOCATION/python3
./configure --prefix=$prefix
make -j
make install

# PIP
$prefix/bin/pip3 install --upgrade pip

# IPYTHON
$prefix/bin/pip3 install ipython

# ASTROPY, NUMPY
$prefix/bin/pip3 install astropy


# LN - provide a default python here as well (they do pip and ipython, why not python)
ln -s $prefix/bin/python3 $prefix/bin/python

cd ..

echo "set path = ($INSTALLOCATION/python3/bin \$path); rehash" >> python_start.csh
echo "export PATH=$INSTALLOCATION/python3/bin:\$PATH"          >> python_start.sh