{{tag>pip python}}
====== Virtual env ======

** Install new env on the system (64 bit/32 bit) **

User virtualenv and pip to avoid dependency problems.

    $ yum install python2.6 python-setuptools python-imaging
    $ virtualenv mysite-env
    $ source mysite-env/bin/activate
    (env)$ pip install django==1.3.1 django-cms south
    (env)$ django-admin.py startproject mycmsproject

====== Packages Installation ======    
===== Python Image Library =====

Starting project may issue error PIL (python image lib) not installed.
Installing PIL requires python-devel to compile PIL:
    
    $ sudo yum install python-devel
    (env)$ pip search PIL
    (env)$ pip install PIL
    
==== Replaced by Pillow ====
Install ext. image libs first:
    sudo yum install libtiff-devel libjpeg-devel libzip-devel freetype-devel \
    lcms2-devel libwebp-devel tcl-devel tk-devel
    pip install Pillow
    
===== Local installation =====
Install third-party app in current project:

<code>
(vfoss_env)[td@localhost vfoss_org]$ pip install --install-option="--install-purelib=$(pwd)" easy_thumbnails
</code>

Install lib locally from source. If a plugin is developed in other directory, it must be installed as a local app. Go to plugin source directory e.g. cmsplugin_news.
<code>
# put dest-dir on PYTHONPATH otherwise there is error message.
(vfoss_env)[td@localhost vfoss_org]$ export PYTHONPATH=/home/td/workspace/vfossorg_pj/vfoss_org/ <-- dest_dir
(vfoss_env)[td@localhost vfoss_org]$ python setup.py install --install-purelib=dest_dir 

</code>



Dump libs: 
    $ pip freeze>requirements.txt
    $ pip install -r requirements.txt 
    
====== Remove Packages ======
Uninstall specific version. 

    pip install MySQL_python==1.2.2