# Installation

## Supported Shells

virtualenvwrapper is a set of shell functions defined in Bourne shell compatible syntax. Its automated tests run under these shells on OS X and Linux:

• bash
• ksh
• zsh

It may work with other shells, so if you find that it does work with a shell not listed here please let me know. If you can modify it to work with another shell without completely rewriting it, then send a pull request through the bitbucket project page. If you write a clone to work with an incompatible shell, let me know and I will link to it from this page.

### MSYS

It is possible to use virtualenv wrapper under MSYS with a native Windows Python installation. In order to make it work, you need to define an extra environment variable named MSYS_HOME containing the root path to the MSYS installation.

export WORKON_HOME=$HOME/.virtualenvs export MSYS_HOME=/c/msys/1.0 source /usr/local/bin/virtualenvwrapper.sh  or: export WORKON_HOME=$HOME/.virtualenvs
export MSYS_HOME=C:\msys\1.0
source /usr/local/bin/virtualenvwrapper.sh


Depending on your MSYS setup, you may need to install the MSYS mktemp binary in the MSYS_HOME/bin folder.

### PowerShell

Guillermo López-Anglada has ported virtualenvwrapper to run under Microsoft's PowerShell. We have agreed that since it is not compatible with the rest of the extensions, and is largely a re-implementation (rather than an adaptation), it should be distributed separately. You can download virtualenvwrapper-powershell from PyPI.

## Python Versions

virtualenvwrapper is tested under Python 2.4 - 2.7.

## Basic Installation

virtualenvwrapper should be installed into the same global site-packages area where virtualenv is installed. You may need administrative privileges to do that. The easiest way to install it is using pip:

$pip install virtualenvwrapper  or: $ sudo pip install virtualenvwrapper


Warning

virtualenv lets you create many different Python environments. You should only ever install virtualenv and virtualenvwrapper on your base Python installation (i.e. NOT while a virtualenv is active) so that the same release is shared by all Python environments that depend on it.

An alternative to installing it into the global site-packages is to add it to your user local directory (usually ~/.local).

$pip install --install-option="--user" virtualenvwrapper  ## Shell Startup File Add three lines to your shell startup file (.bashrc, .profile, etc.) to set the location where the virtual environments should live, the location of your development project directorkes, and the location of the script installed with this package: export WORKON_HOME=$HOME/.virtualenvs

### Location of Project Directories

The variable PROJECT_HOME tells virtualenvwrapper where to place your project working directories. The variable must be set and the directory created before :ref:command-mkproject is used.

### Python Interpreter, virtualenv, and $PATH During startup, virtualenvwrapper.sh finds the first python and virtualenv programs on the$PATH and remembers them to use later. This eliminates any conflict as the $PATH changes, enabling interpreters inside virtual environments where virtualenvwrapper is not installed or where different versions of virtualenv are installed. Because of this behavior, it is important for the$PATH to be set before sourcing virtualenvwrapper.sh. For example:

export PATH=/usr/local/bin:$PATH source /usr/local/bin/virtualenvwrapper.sh  To override the$PATH search, set the variable VIRTUALENVWRAPPER_PYTHON to the full path of the interpreter to use and VIRTUALENVWRAPPER_VIRTUALENV to the full path of the virtualenv binary to use. Both variables must be set before sourcing virtualenvwrapper.sh. For example:

export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
source /usr/local/bin/virtualenvwrapper.sh


### Default Arguments for virtualenv

If the application identified by VIRTUALENVWRAPPER_VIRTUALENV needs arguments, they can be set in VIRTUALENVWRAPPER_VIRTUALENV_ARGS. The same variable can be used to set default arguments to be passed to virtualenv. For example, set the value to --no-site-packages to ensure that all new environments are isolated from the system site-packages directory.

export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'


### Temporary Files

virtualenvwrapper creates temporary files in \$TMPDIR. If the variable is not set, it uses /tmp. To change the location of temporary files just for virtualenvwrapper, set VIRTUALENVWRAPPER_TMPDIR.

### Site-wide Configuration

Most UNIX systems include the ability to change the configuration for all users. This typically takes one of two forms: editing the skeleton files for new accounts or editing the global startup file for a shell.

Editing the skeleton files for new accounts means that each new user will have their private startup files preconfigured to load virtualenvwrapper. They can disable it by commenting out or removing those lines. Refer to the documentation for the shell and operating system to identify the appropriate file to edit.

Modifying the global startup file for a given shell means that all users of that shell will have virtualenvwrapper enabled, and they cannot disable it. Refer to the documentation for the shell to identify the appropriate file to edit.

## Upgrading to 2.9

Version 2.9 includes the features previously delivered separately by virtualenvwrapper.project. If you have an older verison of the project extensions installed, remove them before upgrading.

## Upgrading from 1.x

The shell script containing the wrapper functions has been renamed in the 2.x series to reflect the fact that shells other than bash are supported. In your startup file, change source /usr/local/bin/virtualenvwrapper_bashrc to source /usr/local/bin/virtualenvwrapper.sh.