Python

We provide as many modules as possible that come with the current Debian GNU/Linux stable release. Nevertheless, that might not be enough for your needs since you may want to use the newest version of some module or one that is not part of Debian. Furthermore you might want to use a different version of Python.

The recommended way to install additional python modules is through pip. Unfortunately, pip does not allow users to install modules in the user context. That means that you will first have to install your own version of python in your home. From that moment on, you can install modules through pip.

Installing your own python versions with pyenv

Pyenv is a collection of tools that allow users to manage different versions of python. In the simplest case you will need it to simply get an installation of python in your user space. Using that custom python installation, you will then be able to install additional modules in a very comfortable way, since you can install them in the "system path" (which is then somewhere within your home).

Here is a small howto for installing python 2.7.11 in your home:

• Install pyenv:

  curl https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer -o pyenv-installer

  Check what the script is doing and then execute it:

  bash ./pyenv-installer

  You can remove the installer file afterwards.
• Add the following three lines to your ~/.bashrc:

  export PATH="$HOME/.pyenv/bin:$PATH"
  eval "$(pyenv init -)" 
  eval "$(pyenv virtualenv-init -)"

• Restart your shell so the path changes take effect:

  exec $SHELL

• Install some python version, e.g. for python 2.7.11:

  env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 2.7.11
  pyenv rehash

  Note, that settting of PYTHON_CONFIGURE_OPTS="--enable-shared" is needef if you need to link against the libpython shared library.

• Make sure that this new python version will be used when you run python. You only need to run this command once:

  pyenv global 2.7.11

• In order to update pyenv run:

  pyenv update

Documentation of pyenv

• Website of pyenv	https://github.com/yyuu/pyenv/
  Website of pyenv installer	https://github.com/yyuu/pyenv-installer

Installation of additional or newer modules with pip

Once you installed your custom python with the explanations given above, you are ready to install additional or newer modules the easy way. The usage of pip is very easy. The following command installs the module numpy

pip install numpy

while the next command would upgrade an existing installation of numpy

pip install --upgrade numpy

For advanced usage of pip, please consult the manuals: http://pip.readthedocs.org/en/latest/

Installation of Python modules that are not available in the archives of pip

Here we provide some shell script snippets for installing frequently asked modules which cannot be installed through pip. These scripts just provide an example installation. You might have to adapt some paths in order to make the module work correctly with the version of python you are using (e.g. if you run your custom python provided through pyenv).

nlopt

   1 #!/bin/bash
   2 
   3 # Installation script for nlopt library
   4 
   5 VERSION=2.3
   6 INSTALLDIR=$HOME/.local
   7 BUILDDIR=/scratch/$USER/nlopt
   8 
   9 mkdir -p $BUILDDIR
  10 cd $BUILDDIR
  11 
  12 wget "http://ab-initio.mit.edu/nlopt/nlopt-${VERSION}.tar.gz"
  13 tar -xvvzkf nlopt-${VERSION}.tar.gz
  14 cd nlopt-${VERSION}
  15 
  16 ./configure \
  17         --enable-shared \
  18         --prefix=$INSTALLDIR \
  19         OCT_INSTALL_DIR=$INSTALLDIR/octave/oct \
  20         M_INSTALL_DIR=$INSTALLDIR/octave/m/ \
  21         MEX_INSTALL_DIR=$INSTALLDIR/mex \
  22         GUILE_INSTALL_DIR=$INSTALLDIR/guile
  23 
  24 make
  25 make install

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