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Virtual Python Environment builder

Project description

What It Does

virtualenv is a tool to create isolated Python environments.

The basic problem being addressed is one of dependencies and versions, and indirectly permissions. Imagine you have an application that needs version 1 of LibFoo, but another application requires version 2. How can you use both these applications? If you install everything into /usr/lib/python2.7/site-packages (or whatever your platform’s standard location is), it’s easy to end up in a situation where you unintentionally upgrade an application that shouldn’t be upgraded.

Or more generally, what if you want to install an application and leave it be? If an application works, any change in its libraries or the versions of those libraries can break the application.

Also, what if you can’t install packages into the global site-packages directory? For instance, on a shared host.

In all these cases, virtualenv can help you. It creates an environment that has its own installation directories, that doesn’t share libraries with other virtualenv environments (and optionally doesn’t access the globally installed libraries either).


To install globally with pip (if you have pip 1.3 or greater installed globally):

$ [sudo] pip install virtualenv

Or to get the latest unreleased dev version:

$ [sudo] pip install

To install globally from source:

$ curl -O
$ tar xvfz virtualenv-X.X.tar.gz
$ cd virtualenv-X.X
$ [sudo] python install

To use locally from source:

$ curl -O
$ tar xvfz virtualenv-X.X.tar.gz
$ cd virtualenv-X.X
$ python myVE


The basic usage is:

$ virtualenv ENV

This creates ENV/lib/pythonX.X/site-packages, where any libraries you install will go. It also creates ENV/bin/python, which is a Python interpreter that uses this environment. Anytime you use that interpreter (including when a script has #!/path/to/ENV/bin/python in it) the libraries in that environment will be used.

It also installs either Setuptools into the environment.

A new virtualenv also includes the pip installer, so you can use ENV/bin/pip to install additional packages into the environment.

activate script

In a newly created virtualenv there will be a bin/activate shell script. For Windows systems, activation scripts are provided for CMD.exe and Powershell.

On Posix systems you can do:

$ source bin/activate

This will change your $PATH so its first entry is the virtualenv’s bin/ directory. (You have to use source because it changes your shell environment in-place.) This is all it does; it’s purely a convenience. If you directly run a script or the python interpreter from the virtualenv’s bin/ directory (e.g. path/to/env/bin/pip or /path/to/env/bin/python there’s no need for activation.

After activating an environment you can use the function deactivate to undo the changes to your $PATH.

The activate script will also modify your shell prompt to indicate which environment is currently active. You can disable this behavior, which can be useful if you have your own custom prompt that already displays the active environment name. To do so, set the VIRTUAL_ENV_DISABLE_PROMPT environment variable to any non-empty value before running the activate script.

On Windows you just do:

> \path\to\env\Scripts\activate

And type deactivate to undo the changes.

Based on your active shell (CMD.exe or Powershell.exe), Windows will use either activate.bat or activate.ps1 (as appropriate) to activate the virtual environment. If using Powershell, see the notes about code signing below.

The --system-site-packages Option

If you build with virtualenv --system-site-packages ENV, your virtual environment will inherit packages from /usr/lib/python2.7/site-packages (or wherever your global site-packages directory is).

This can be used if you have control over the global site-packages directory, and you want to depend on the packages there. If you want isolation from the global system, do not use this flag.

Environment variables and configuration files

virtualenv can not only be configured by passing command line options such as --python but also by two other means:

  • Environment variables

    Each command line option is automatically used to look for environment variables with the name format VIRTUALENV_<UPPER_NAME>. That means the name of the command line options are capitalized and have dashes ('-') replaced with underscores ('_').

    For example, to automatically use a custom Python binary instead of the one virtualenv is run with you can also set an environment variable:

    $ export VIRTUALENV_PYTHON=/opt/python-3.3/bin/python
    $ virtualenv ENV

    It’s the same as passing the option to virtualenv directly:

    $ virtualenv --python=/opt/python-3.3/bin/python ENV

    This also works for appending command line options, like --find-links. Just leave an empty space between the passsed values, e.g.:

    $ export VIRTUALENV_EXTRA_SEARCH_DIR="/path/to/dists /path/to/other/dists"
    $ virtualenv ENV

    is the same as calling:

    $ virtualenv --extra-search-dir=/path/to/dists --extra-search-dir=/path/to/other/dists ENV
  • Config files

    virtualenv also looks for a standard ini config file. On Unix and Mac OS X that’s $HOME/.virtualenv/virtualenv.ini and on Windows, it’s %APPDATA%\virtualenv\virtualenv.ini.

    The names of the settings are derived from the long command line option, e.g. the option --python would look like this:

    python = /opt/python-3.3/bin/python

    Appending options like --extra-search-dir can be written on multiple lines:

    extra-search-dir =

Please have a look at the output of virtualenv --help for a full list of supported options.

Windows Notes

Some paths within the virtualenv are slightly different on Windows: scripts and executables on Windows go in ENV\Scripts\ instead of ENV/bin/ and libraries go in ENV\Lib\ rather than ENV/lib/.

To create a virtualenv under a path with spaces in it on Windows, you’ll need the win32api library installed.

PyPy Support

Beginning with virtualenv version 1.5 PyPy is supported. To use PyPy 1.4 or 1.4.1, you need a version of virtualenv >= 1.5. To use PyPy 1.5, you need a version of virtualenv >= 1.6.1.

Creating Your Own Bootstrap Scripts

While this creates an environment, it doesn’t put anything into the environment. Developers may find it useful to distribute a script that sets up a particular environment, for example a script that installs a particular web application.

To create a script like this, call virtualenv.create_bootstrap_script(extra_text), and write the result to your new bootstrapping script. Here’s the documentation from the docstring:

Creates a bootstrap script, which is like this script but with extend_parser, adjust_options, and after_install hooks.

This returns a string that (written to disk of course) can be used as a bootstrap script with your own customizations. The script will be the standard script, with your extra text added (your extra text should be Python code).

If you include these functions, they will be called:


You can add or remove options from the parser here.

adjust_options(options, args):

You can change options here, or change the args (if you accept different kinds of arguments, be sure you modify args so it is only [DEST_DIR]).

after_install(options, home_dir):

After everything is installed, this function is called. This is probably the function you are most likely to use. An example would be:

def after_install(options, home_dir):
    if sys.platform == 'win32':
        bin = 'Scripts'
        bin = 'bin'[join(home_dir, bin, 'easy_install'),
                     'MyPackage'])[join(home_dir, bin, 'my-package-script'),
                     'setup', home_dir])

This example immediately installs a package, and runs a setup script from that package.

Bootstrap Example

Here’s a more concrete example of how you could use this:

import virtualenv, textwrap
output = virtualenv.create_bootstrap_script(textwrap.dedent("""
import os, subprocess
def after_install(options, home_dir):
    etc = join(home_dir, 'etc')
    if not os.path.exists(etc):
        os.makedirs(etc)[join(home_dir, 'bin', 'easy_install'),
                     'BlogApplication'])[join(home_dir, 'bin', 'paster'),
                     'make-config', 'BlogApplication',
                     join(etc, 'blog.ini')])[join(home_dir, 'bin', 'paster'),
                     'setup-app', join(etc, 'blog.ini')])
f = open('', 'w').write(output)

Another example is available here.

Using Virtualenv without bin/python

Sometimes you can’t or don’t want to use the Python interpreter created by the virtualenv. For instance, in a mod_python or mod_wsgi environment, there is only one interpreter.

Luckily, it’s easy. You must use the custom Python interpreter to install libraries. But to use libraries, you just have to be sure the path is correct. A script is available to correct the path. You can setup the environment like:

activate_this = '/path/to/env/bin/'
execfile(activate_this, dict(__file__=activate_this))

This will change sys.path and even change sys.prefix, but also allow you to use an existing interpreter. Items in your environment will show up first on sys.path, before global items. However, global items will always be accessible (as if the --system-site-packages flag had been used in creating the environment, whether it was or not). Also, this cannot undo the activation of other environments, or modules that have been imported. You shouldn’t try to, for instance, activate an environment before a web request; you should activate one environment as early as possible, and not do it again in that process.

Making Environments Relocatable

Note: this option is somewhat experimental, and there are probably caveats that have not yet been identified.

Normally environments are tied to a specific path. That means that you cannot move an environment around or copy it to another computer. You can fix up an environment to make it relocatable with the command:

$ virtualenv --relocatable ENV

This will make some of the files created by setuptools use relative paths, and will change all the scripts to use instead of using the location of the Python interpreter to select the environment.

Note: scripts which have been made relocatable will only work if the virtualenv is activated, specifically the python executable from the virtualenv must be the first one on the system PATH. Also note that the activate scripts are not currently made relocatable by virtualenv --relocatable.

Note: you must run this after you’ve installed any packages into the environment. If you make an environment relocatable, then install a new package, you must run virtualenv --relocatable again.

Also, this does not make your packages cross-platform. You can move the directory around, but it can only be used on other similar computers. Some known environmental differences that can cause incompatibilities: a different version of Python, when one platform uses UCS2 for its internal unicode representation and another uses UCS4 (a compile-time option), obvious platform changes like Windows vs. Linux, or Intel vs. ARM, and if you have libraries that bind to C libraries on the system, if those C libraries are located somewhere different (either different versions, or a different filesystem layout).

If you use this flag to create an environment, currently, the --system-site-packages option will be implied.

The --extra-search-dir option

This option allows you to provide your own versions of setuptools and/or pip on the filesystem, and tell virtualenv to use those distributions instead of the ones in virtualenv_support.

To use this feature, pass one or more --extra-search-dir options to virtualenv like this:

$ virtualenv --extra-search-dir=/path/to/distributions ENV

The /path/to/distributions path should point to a directory that contains setuptools and/or pip distributions. Setuptools distributions must be .egg files; pip distributions should be .tar.gz source distributions.

If no satisfactory local distributions are found, virtualenv will fail. Virtualenv will never download packages.

The distribution lookup is done in the following locations, with the most recent version found used:

  1. The current directory.

  2. The directory where is located.

  3. A virtualenv_support directory relative to the directory where is located.

  4. If the file being executed is not named (i.e. is a boot script), a virtualenv_support directory relative to wherever is actually installed.

Compare & Contrast with Alternatives

There are several alternatives that create isolated environments:

  • workingenv (which I do not suggest you use anymore) is the predecessor to this library. It used the main Python interpreter, but relied on setting $PYTHONPATH to activate the environment. This causes problems when running Python scripts that aren’t part of the environment (e.g., a globally installed hg or bzr). It also conflicted a lot with Setuptools.

  • virtual-python is also a predecessor to this library. It uses only symlinks, so it couldn’t work on Windows. It also symlinks over the entire standard library and global site-packages. As a result, it won’t see new additions to the global site-packages.

    This script only symlinks a small portion of the standard library into the environment, and so on Windows it is feasible to simply copy these files over. Also, it creates a new/empty site-packages and also adds the global site-packages to the path, so updates are tracked separately. This script also installs Setuptools automatically, saving a step and avoiding the need for network access.

  • zc.buildout doesn’t create an isolated Python environment in the same style, but achieves similar results through a declarative config file that sets up scripts with very particular packages. As a declarative system, it is somewhat easier to repeat and manage, but more difficult to experiment with. zc.buildout includes the ability to setup non-Python systems (e.g., a database server or an Apache instance).

I strongly recommend anyone doing application development or deployment use one of these tools.


Refer to the contributing to pip documentation - it applies equally to virtualenv, except that virtualenv issues should filed on the virtualenv repo at GitHub.

Virtualenv’s release schedule is tied to pip’s – each time there’s a new pip release, there will be a new virtualenv release that bundles the new version of pip.

Files in the virtualenv_embedded/ subdirectory are embedded into itself as base64-encoded strings (in order to support single-file use of without installing it). If your patch changes any file in virtualenv_embedded/, run bin/ to update the embedded version of that file in; commit that and submit it as part of your patch / pull request.

Running the tests

Virtualenv’s test suite is small and not yet at all comprehensive, but we aim to grow it.

The easy way to run tests (handles test dependencies automatically):

$ python test

If you want to run only a selection of the tests, you’ll need to run them directly with nose instead. Create a virtualenv, and install required packages:

$ pip install nose mock

Run nosetests:

$ nosetests

Or select just a single test file to run:

$ nosetests tests.test_virtualenv

Status and License

virtualenv is a successor to workingenv, and an extension of virtual-python.

It was written by Ian Bicking, sponsored by the Open Planning Project and is now maintained by a group of developers. It is licensed under an MIT-style permissive license.

Changes & News

1.10.1 (2013-08-07)

  • New Signing Key Release 1.10.1 is using a different key than normal with fingerprint: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA

  • Upgraded pip to v1.4.1

  • Upgraded setuptools to v0.9.8

1.10 (2013-07-23)

  • BACKWARDS INCOMPATIBLE Dropped support for Python 2.5. The minimum supported Python version is now Python 2.6.

  • BACKWARDS INCOMPATIBLE Using as an isolated script (i.e. without an associated virtualenv_support directory) is no longer supported for security reasons and will fail with an error.

    Along with this, --never-download is now always pinned to True, and is only being maintained in the short term for backward compatibility (Pull #412).

  • IMPORTANT Switched to the new setuptools (v0.9.7) which has been merged with Distribute again and works for Python 2 and 3 with one codebase. The --distribute and --setuptools options are now no-op.

  • Updated to pip 1.4.

  • Added support for PyPy3k

  • Added the option to use a version number with the -p option to get the system copy of that Python version (Windows only)

  • Removed embedded, and files as part of switching to merged setuptools.

  • Fixed --relocatable to work better on Windows.

  • Fixed issue with readline on Windows.

1.9.1 (2013-03-08)

  • Updated to pip 1.3.1 that fixed a major backward incompatible change of parsing URLs to externally hosted packages that got accidentily included in pip 1.3.

1.9 (2013-03-07)

  • Unset VIRTUAL_ENV environment variable in deactivate.bat (Pull #364)

  • Upgraded distribute to 0.6.34.

  • Added --no-setuptools and --no-pip options (Pull #336).

  • Fixed Issue #373. virtualenv-1.8.4 was failing in cygwin (Pull #382).

  • Fixed Issue #378. virtualenv is now “multiarch” aware on debian/ubuntu (Pull #379).

  • Fixed issue with readline module path on pypy and OSX (Pull #374).

  • Made 64bit detection compatible with Python 2.5 (Pull #393).

1.8.4 (2012-11-25)

  • Updated distribute to 0.6.31. This fixes #359 (numpy install regression) on UTF-8 platforms, and provides a workaround on other platforms: PYTHONIOENCODING=utf8 pip install numpy.

  • When installing virtualenv via curl, don’t forget to filter out arguments the distribute setup script won’t understand. Fixes #358.

  • Added some more integration tests.

  • Removed the unsupported embedded setuptools egg for Python 2.4 to reduce file size.

1.8.3 (2012-11-21)

  • Fixed readline on OS X. Thanks minrk

  • Updated distribute to 0.6.30 (improves our error reporting, plus new distribute features and fixes). Thanks Gabriel (g2p)

  • Added compatibility with multiarch Python (Python 3.3 for example). Added an integration test. Thanks Gabriel (g2p)

  • Added ability to install distribute from a user-provided egg, rather than the bundled sdist, for better speed. Thanks Paul Moore.

  • Make the creation of lib64 symlink smarter about already-existing symlink, and more explicit about full paths. Fixes #334 and #330. Thanks Jeremy Orem.

  • Give lib64 site-dir preference over lib on 64-bit systems, to avoid wrong 32-bit compiles in the venv. Fixes #328. Thanks Damien Nozay.

  • Fix a bug with prompt-handling in activate.csh in non-interactive csh shells. Fixes #332. Thanks Benjamin Root for report and patch.

  • Make it possible to create a virtualenv from within a Python 3.3. pyvenv. Thanks Chris McDonough for the report.

  • Add optional –setuptools option to be able to switch to it in case distribute is the default (like in Debian).

1.8.2 (2012-09-06)

  • Updated the included pip version to 1.2.1 to fix regressions introduced there in 1.2.

1.8.1 (2012-09-03)

  • Fixed distribute version used with –never-download. Thanks michr for report and patch.

  • Fix creating Python 3.3 based virtualenvs by unsetting the __PYVENV_LAUNCHER__ environment variable in subprocesses.

1.8 (2012-09-01)

  • Dropped support for Python 2.4 The minimum supported Python version is now Python 2.5.

  • Fix –relocatable on systems that use lib64. Fixes #78. Thanks Branden Rolston.

  • Symlink some additional modules under Python 3. Fixes #194. Thanks Vinay Sajip, Ian Clelland, and Stefan Holek for the report.

  • Fix --relocatable when a script uses __future__ imports. Thanks Branden Rolston.

  • Fix a bug in the config option parser that prevented setting negative options with environemnt variables. Thanks Ralf Schmitt.

  • Allow setting --no-site-packages from the config file.

  • Use /usr/bin/multiarch-platform if available to figure out the include directory. Thanks for the patch, Mika Laitio.

  • Fix install_name_tool replacement to work on Python 3.X.

  • Handle paths of users’ site-packages on Mac OS X correctly when changing the prefix.

  • Updated the embedded version of distribute to 0.6.28 and pip to 1.2.

1.7.2 (2012-06-22)

  • Updated to distribute 0.6.27.

  • Fix on OS X. Fixes #8. Thanks David Schoonover.

  • Create a virtualenv-x.x script with the Python version when installing, so virtualenv for multiple Python versions can be installed to the same script location. Thanks Miki Tebeka.

  • Restored ability to create a virtualenv with a path longer than 78 characters, without breaking creation of virtualenvs with non-ASCII paths. Thanks, Bradley Ayers.

  • Added ability to create virtualenvs without having installed Apple’s developers tools (using an own implementation of install_name_tool). Thanks Mike Hommey.

  • Fixed PyPy and Jython support on Windows. Thanks Konstantin Zemlyak.

  • Added pydoc script to ease use. Thanks Marc Abramowitz. Fixes #149.

  • Fixed creating a bootstrap script on Python 3. Thanks Raul Leal. Fixes #280.

  • Fixed inconsistency when having set the PYTHONDONTWRITEBYTECODE env var with the –distribute option or the VIRTUALENV_USE_DISTRIBUTE env var. VIRTUALENV_USE_DISTRIBUTE is now considered again as a legacy alias. (2012-02-17)

  • Fixed minor issue in –relocatable. Thanks, Cap Petschulat. (2012-02-16)

  • Bumped the version string in up, too.

  • Fixed rST rendering bug of long description.

1.7.1 (2012-02-16)

  • Update embedded pip to version 1.1.

  • Fix –relocatable under Python 3. Thanks Doug Hellmann.

  • Added environ PATH modification to Thanks Doug Napoleone. Fixes #14.

  • Support creating virtualenvs directly from a Python build directory on Windows. Thanks CBWhiz. Fixes #139.

  • Use non-recursive symlinks to fix things up for posix_local install scheme. Thanks michr.

  • Made activate script available for use with msys and cygwin on Windows. Thanks Greg Haskins, Cliff Xuan, Jonathan Griffin and Doug Napoleone. Fixes #176.

  • Fixed creation of virtualenvs on Windows when Python is not installed for all users. Thanks Anatoly Techtonik for report and patch and Doug Napoleone for testing and confirmation. Fixes #87.

  • Fixed creation of virtualenvs using -p in installs where some modules that ought to be in the standard library (e.g. readline) are actually installed in site-packages next to Thanks Greg Haskins for report and fix. Fixes #167.

  • Added activation script for Powershell (signed by Jannis Leidel). Many thanks to Jason R. Coombs.

1.7 (2011-11-30)

  • Gave user-provided --extra-search-dir priority over default dirs for finding setuptools/distribute (it already had priority for finding pip). Thanks Ethan Jucovy.

  • Updated embedded Distribute release to 0.6.24. Thanks Alex Gronholm.

  • Made --no-site-packages behavior the default behavior. The --no-site-packages flag is still permitted, but displays a warning when used. Thanks Chris McDonough.

  • New flag: --system-site-packages; this flag should be passed to get the previous default global-site-package-including behavior back.

  • Added ability to set command options as environment variables and options in a virtualenv.ini file.

  • Fixed various encoding related issues with paths. Thanks Gunnlaugur Thor Briem.

  • Made script executable.

1.6.4 (2011-07-21)

  • Restored ability to run on Python 2.4, too.

1.6.3 (2011-07-16)

  • Restored ability to run on Python < 2.7.

1.6.2 (2011-07-16)

  • Updated embedded distribute release to 0.6.19.

  • Updated embedded pip release to 1.0.2.

  • Fixed #141 - Be smarter about finding pkg_resources when using the non-default Python intepreter (by using the -p option).

  • Fixed #112 - Fixed path in docs.

  • Fixed #109 - Corrected doctests of a Logger method.

  • Fixed #118 - Fixed creating virtualenvs on platforms that use the “posix_local” install scheme, such as Ubuntu with Python 2.7.

  • Add missing library to Python 3 virtualenvs (_dummy_thread).

1.6.1 (2011-04-30)

  • Start to use git-flow.

  • Added support for PyPy 1.5

  • Fixed #121 – added sanity-checking of the -p argument. Thanks Paul Nasrat.

  • Added progress meter for pip installation as well as setuptools. Thanks Ethan Jucovy.

  • Added –never-download and –search-dir options. Thanks Ethan Jucovy.


  • Added Python 3 support! Huge thanks to Vinay Sajip and Vitaly Babiy.

  • Fixed creation of virtualenvs on Mac OS X when standard library modules (readline) are installed outside the standard library.

  • Updated bundled pip to 1.0.



  • Added _weakrefset requirement for Python 2.7.1.

  • Fixed Windows regression in 1.5


  • Include pip 0.8.1.

  • Add support for PyPy.

  • Uses a proper temporary dir when installing environment requirements.

  • Add --prompt option to be able to override the default prompt prefix.

  • Fix an issue with --relocatable on Windows.

  • Fix issue with installing the wrong version of distribute.

  • Add fish and csh activate scripts.


  • Include pip 0.7.2


  • Fix for Mac OS X Framework builds that use --universal-archs=intel

  • Fix on Windows.

  • Allow $PYTHONHOME to be set, so long as you use source bin/activate it will get unset; if you leave it set and do not activate the environment it will still break the environment.

  • Include pip 0.7.1


  • Include pip 0.7


  • Allow to skip updating the prompt (by setting $VIRTUAL_ENV_DISABLE_PROMPT).


  • Include pip 0.6.3

  • Fix activate.bat and deactivate.bat under Windows when PATH contained a parenthesis


  • Include pip 0.6.2 and Distribute 0.6.10

  • Create the virtualenv script even when Setuptools isn’t installed

  • Fix problem with virtualenv --relocate when bin/ has subdirectories (e.g., bin/.svn/); from Alan Franzoni.

  • If you set $VIRTUALENV_DISTRIBUTE then virtualenv will use Distribute by default (so you don’t have to remember to use --distribute).


  • Include pip 0.6.1


  • Fix pip installation on Windows

  • Fix use of stand-alone (and boot scripts)

  • Exclude ~/.local (user site-packages) from environments when using --no-site-packages


  • Include pip 0.6


  • Updated setuptools to 0.6c11

  • Added the –distribute option

  • Fixed packaging problem of support-files


  • Virtualenv now copies the actual embedded Python binary on Mac OS X to fix a hang on Snow Leopard (10.6).

  • Fail more gracefully on Windows when win32api is not installed.

  • Fix site-packages taking precedent over Jython’s __classpath__ and also specially handle the new __pyclasspath__ entry in sys.path.

  • Now copies Jython’s registry file to the virtualenv if it exists.

  • Better find libraries when compiling extensions on Windows.

  • Create Scripts\pythonw.exe on Windows.

  • Added support for the Debian/Ubuntu /usr/lib/pythonX.Y/dist-packages directory.

  • Set distutils.sysconfig.get_config_vars()['LIBDIR'] (based on sys.real_prefix) which is reported to help building on Windows.

  • Make deactivate work on ksh

  • Fixes for --python: make it work with --relocatable and the symlink created to the exact Python version.


  • Use Windows newlines in activate.bat, which has been reported to help when using non-ASCII directory names.

  • Fixed compatibility with Jython 2.5b1.

  • Added a function virtualenv.install_python for more fine-grained access to what virtualenv.create_environment does.

  • Fix a problem with Windows and paths that contain spaces.

  • If /path/to/env/.pydistutils.cfg exists (or /path/to/env/pydistutils.cfg on Windows systems) then ignore ~/.pydistutils.cfg and use that other file instead.

  • Fix ` a problem <>`_ picking up some .so libraries in /usr/local.


  • Remove the [install] prefix = ... setting from the virtualenv distutils.cfg – this has been causing problems for a lot of people, in rather obscure ways.

  • If you use a boot script it will attempt to import virtualenv and find a pre-downloaded Setuptools egg using that.

  • Added platform-specific paths, like /usr/lib/pythonX.Y/plat-linux2


  • Real Python 2.6 compatibility. Backported the Python 2.6 updates to, including user directories (this means older versions of Python will support user directories, whether intended or not).

  • Always set [install] prefix in distutils.cfg – previously on some platforms where a system-wide distutils.cfg was present with a prefix setting, packages would be installed globally (usually in /usr/local/lib/pythonX.Y/site-packages).

  • Sometimes Cygwin seems to leave .exe off sys.executable; a workaround is added.

  • Fix --python option.

  • Fixed handling of Jython environments that use a jython-complete.jar.


  • Update to Setuptools 0.6c9

  • Added an option virtualenv --relocatable EXISTING_ENV, which will make an existing environment “relocatable” – the paths will not be absolute in scripts, .egg-info and .pth files. This may assist in building environments that can be moved and copied. You have to run this after any new packages installed.

  • Added bin/, a file you can use like execfile("path_to/", dict(__file__="path_to/")) – this will activate the environment in place, similar to what the mod_wsgi example does.

  • For Mac framework builds of Python, the site-packages directory /Library/Python/X.Y/site-packages is added to sys.path, from Andrea Rech.

  • Some platform-specific modules in Macs are added to the path now (plat-darwin/, plat-mac/, plat-mac/lib-scriptpackages), from Andrea Rech.

  • Fixed a small Bashism in the bin/activate shell script.

  • Added __future__ to the list of required modules, for Python 2.3. You’ll still need to backport your own subprocess module.

  • Fixed the __classpath__ entry in Jython’s sys.path taking precedent over virtualenv’s libs.


  • Added a --python option to select the Python interpreter.

  • Add warnings to the modules copied over, for Python 2.6 support.

  • Add sets to the module copied over for Python 2.3 (though Python 2.3 still probably doesn’t work).


  • Added support for Jython 2.5.


  • Added support for Python 2.6.

  • Fix a problem with missing DLLs/zlib.pyd on Windows. Create

  • bin/python (or bin/python.exe) even when you run virtualenv with an interpreter named, e.g., python2.4

  • Fix MacPorts Python

  • Added –unzip-setuptools option

  • Update to Setuptools 0.6c8

  • If the current directory is not writable, run in /tmp

  • Copy or symlink over the include directory so that packages will more consistently compile.


  • Fix build on systems that use /usr/lib64, distinct from /usr/lib (specifically CentOS x64).

  • Fixed bug in --clear.

  • Fixed typos in deactivate.bat.

  • Preserve $PYTHONPATH when calling subprocesses.


  • Fix include dir copying on Windows (makes compiling possible).

  • Include the main lib-tk in the path.

  • Patch distutils.sysconfig: get_python_inc and get_python_lib to point to the global locations.

  • Install distutils.cfg before Setuptools, so that system customizations of distutils.cfg won’t effect the installation.

  • Add bin/pythonX.Y to the virtualenv (in addition to bin/python).

  • Fixed an issue with Mac Framework Python builds, and absolute paths (from Ronald Oussoren).


  • Improve ability to create a virtualenv from inside a virtualenv.

  • Fix a little bug in bin/activate.

  • Actually get distutils.cfg to work reliably.


  • Added lib-dynload and config to things that need to be copied over in an environment.

  • Copy over or symlink the include directory, so that you can build packages that need the C headers.

  • Include a distutils package, so you can locally update distutils.cfg (in lib/pythonX.Y/distutils/distutils.cfg).

  • Better avoid downloading Setuptools, and hitting PyPI on environment creation.

  • Fix a problem creating a lib64/ directory.

  • Should work on MacOSX Framework builds (the default Python installations on Mac). Thanks to Ronald Oussoren.


  • Windows installs would sometimes give errors about sys.prefix that were inaccurate.

  • Slightly prettier output.


  • Added support for Windows.


  • Give a better warning if you are on an unsupported platform (Mac Framework Pythons, and Windows).

  • Give error about running while inside a workingenv.

  • Give better error message about Python 2.3.


Fixed packaging of the library.


Initial release. Everything is changed and new!

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