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.. _tips-and-tricks:
=================
Tips and Tricks
=================
This is a list of user-contributed tips for making virtualenv and
virtualenvwrapper even more useful. If you have tip to share, drop me
an email or post a comment on `this blog post
<http://blog.doughellmann.com/2010/01/virtualenvwrapper-tips-and-tricks.html>`__
and I'll add it here.
zsh Prompt
==========
From `Nat <http://www.blogger.com/profile/16779944428406910187>`_:
Using zsh, I added some bits to ``$WORKON_HOME/post(de)activate`` to show
the active virtualenv on the right side of my screen instead.
in ``postactivate``::
PS1="$_OLD_VIRTUAL_PS1"
_OLD_RPROMPT="$RPROMPT"
RPROMPT="%{${fg_bold[white]}%}(env: %{${fg[green]}%}`basename \"$VIRTUAL_ENV\"`%{${fg_bold[white]}%})%{${reset_color}%} $RPROMPT"
and in ``postdeactivate``::
RPROMPT="$_OLD_RPROMPT"
Adjust colors according to your own personal tastes or environment.
Updating cached ``$PATH`` entries
=================================
From `Nat <http://www.blogger.com/profile/16779944428406910187>`_:
I also added the command 'rehash' to ``$WORKON_HOME/postactivate`` and
``$WORKON_HOME/postdeactivate`` as I was having some problems with zsh
not picking up the new paths immediately.
Tying to pip's virtualenv support
=================================
Via http://becomingguru.com/:
Add this to your shell login script to make pip use the same directory
for virtualenvs as virtualenvwrapper::
export PIP_VIRTUALENV_BASE=$WORKON_HOME
and Via Nat:
in addition to what becomingguru said, this line is key::
export PIP_RESPECT_VIRTUALENV=true
That makes pip detect an active virtualenv and install to it, without
having to pass it the -E parameter.
Creating Project Work Directories
=================================
Via `James <http://www.blogger.com/profile/02618224969192901883>`_:
In the ``postmkvirtualenv`` script I have the following to create a
directory based on the project name, add that directory to the python
path and then cd into it::
proj_name=$(echo $VIRTUAL_ENV|awk -F'/' '{print $NF}')
mkdir $HOME/projects/$proj_name
add2virtualenv $HOME/projects/$proj_name
cd $HOME/projects/$proj_name
In the ``postactivate`` script I have it set to automatically change
to the project directory when I use the workon command::
proj_name=$(echo $VIRTUAL_ENV|awk -F'/' '{print $NF}')
cd ~/projects/$proj_name
Automatically Run workon When Entering a Directory
==================================================
`Justin Lily posted
<http://justinlilly.com/python/virtualenv_wrapper_helper.html>`__
about some code he added to his shell environment to look at the
directory each time he runs ``cd``. If it finds a ``.venv`` file, it
activates the environment named within. On leaving that directory,
the current virtualenv is automatically deactivated.
`Harry Marr <http://www.blogger.com/profile/17141199633387157732>`__
wrote a similar function that works with `git repositories
<http://hmarr.com/2010/jan/19/making-virtualenv-play-nice-with-git/>`__.
Installing Common Tools Automatically in New Environments
=========================================================
Via `rizumu <http://rizumu.myopenid.com/>`__:
I have this ``postmkvirtualenv`` to install the get a basic setup.
::
$ cat postmkvirtualenv
#!/usr/bin/env bash
curl -O http://python-distribute.org/distribute_setup.p... />python distribute_setup.py
rm distribute_setup.py
easy_install pip==dev
pip install Mercurial
Then I have a pip requirement file with my dev tools.
::
$ cat developer_requirements.txt
ipdb
ipython
pastescript
nose
http://douglatornell.ca/software/python/Nosy-1.0.tar.gz
coverage
sphinx
grin
pyflakes
pep8
Then each project has it's own pip requirement file for things like
PIL, psycopg2, django-apps, numpy, etc.
Changing the Default Behavior of ``cd``
=======================================
Via `mae <http://www.blogger.com/profile/10879711379090472478>`__:
This is supposed to be executed after workon, that is as a
``postactivate`` hook. It basically overrides ``cd`` to know about the
VENV so instead of doing ``cd`` to go to ``~`` you will go to the venv
root, IMO very handy and I can't live without it anymore. if you pass
it a proper path then it will do the right thing.
::
cd () {
if (( $# == 0 ))
then
builtin cd $VIRTUAL_ENV
else
builtin cd "$@"
fi
}
cd
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