mirror of
https://github.com/triqs/dft_tools
synced 2024-11-01 03:33:50 +01:00
68 lines
1.9 KiB
ReStructuredText
68 lines
1.9 KiB
ReStructuredText
.. _python_install:
|
|
|
|
Python and the scientific python tools
|
|
====================================================
|
|
|
|
On some machines, not all the necessary scientific python tools are present
|
|
(e.g. old distribution, computation centers, etc....), or not in the right version.
|
|
|
|
There is a way to efficiently solve this issue (other than recompiling your own python, and
|
|
all the libs, which is painful) and specially **avoiding any upgrade on your system** (which
|
|
is crucial on cluster machines e.g.).
|
|
|
|
.. _virtualenv:
|
|
.. highlight:: bash
|
|
|
|
Using virtualenv to install/upgrade some python packages locally
|
|
----------------------------------------------------------------------------
|
|
|
|
In the frequent cases where only one or two packages are missing, there is a simple solution
|
|
called virtualenv.
|
|
|
|
Principle
|
|
^^^^^^^^^^^^
|
|
|
|
virtualenv is a python package that allow you to install in your home a simple copy (or mirror)
|
|
or python, and install and upgrade some packages for you, without touching the systems.
|
|
|
|
.. warning:: This works as long as the other dependencies of the packages on e.g. C++ libraries are satisfied.
|
|
|
|
Usage
|
|
^^^^^^^^
|
|
|
|
* First install virtualenv, or ask the system manager to do it.
|
|
On ubuntu ::
|
|
|
|
sudo apt-get install python-virtualenv
|
|
|
|
* To create a new python in your home, do e.g. ::
|
|
|
|
virtualenv ~/.my_python --system-site-packages
|
|
|
|
This create in ~/.my_python a clone of the python of the system, with its packages.
|
|
|
|
You can then use it with ::
|
|
|
|
~/.my_python/bin/python
|
|
|
|
* To make this your default python, just add in your ~/.bash_aliases (or bashrc) ::
|
|
|
|
source $HOME/.my_python/bin/activate
|
|
|
|
Then (reopen your terminal ...) ::
|
|
|
|
which python
|
|
|
|
should return typically::
|
|
|
|
/home/ME/.my_python/bin/python
|
|
|
|
* You can install any python package for this local python installation, e.g. ::
|
|
|
|
easy_install --upgrade ipython
|
|
easy_install --upgrade cython
|
|
|
|
and you have the latest ipython notebook, and cython
|
|
|
|
|