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<li class="toctree-l2"><a class="reference internal" href="#virtualenv-command"><code class="docutils literal notranslate"><span class="pre">virtualenv</span></code> Command</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#usage">Usage</a></li>
<li class="toctree-l3"><a class="reference internal" href="#options">Options</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#environment-variables">Environment Variables</a></li>
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<div class="section" id="reference-guide">
<h1>Reference Guide<a class="headerlink" href="#reference-guide" title="Permalink to this headline">¶</a></h1>
<div class="section" id="virtualenv-command">
<h2><code class="docutils literal notranslate"><span class="pre">virtualenv</span></code> Command<a class="headerlink" href="#virtualenv-command" title="Permalink to this headline">¶</a></h2>
<div class="section" id="usage">
<span id="id1"></span><h3>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h3>
<p><strong class="command">virtualenv [OPTIONS] ENV_DIR</strong></p>
<blockquote>
<div>Where <code class="docutils literal notranslate"><span class="pre">ENV_DIR</span></code> is an absolute or relative path to a directory to create
the virtual environment in.</div></blockquote>
</div>
<div class="section" id="options">
<span id="id2"></span><h3>Options<a class="headerlink" href="#options" title="Permalink to this headline">¶</a></h3>
<dl class="option">
<dt id="cmdoption-version">
<code class="descname">--version</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-version" title="Permalink to this definition">¶</a></dt>
<dd><p>show program’s version number and exit</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-h">
<code class="descname">-h</code><code class="descclassname"></code><code class="descclassname">, </code><code class="descname">--help</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-h" title="Permalink to this definition">¶</a></dt>
<dd><p>show this help message and exit</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-v">
<code class="descname">-v</code><code class="descclassname"></code><code class="descclassname">, </code><code class="descname">--verbose</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-v" title="Permalink to this definition">¶</a></dt>
<dd><p>Increase verbosity.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-q">
<code class="descname">-q</code><code class="descclassname"></code><code class="descclassname">, </code><code class="descname">--quiet</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-q" title="Permalink to this definition">¶</a></dt>
<dd><p>Decrease verbosity.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-p">
<code class="descname">-p</code><code class="descclassname"> PYTHON_EXE</code><code class="descclassname">, </code><code class="descname">--python</code><code class="descclassname">=PYTHON_EXE</code><a class="headerlink" href="#cmdoption-p" title="Permalink to this definition">¶</a></dt>
<dd><p>The Python interpreter to use, e.g.,
–python=python2.5 will use the python2.5 interpreter
to create the new environment. The default is the
interpreter that virtualenv was installed with
(like <code class="docutils literal notranslate"><span class="pre">/usr/bin/python</span></code>)</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-clear">
<code class="descname">--clear</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-clear" title="Permalink to this definition">¶</a></dt>
<dd><p>Clear out the non-root install and start from scratch.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-system-site-packages">
<code class="descname">--system-site-packages</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-system-site-packages" title="Permalink to this definition">¶</a></dt>
<dd><p>Give the virtual environment access to the global
site-packages.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-always-copy">
<code class="descname">--always-copy</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-always-copy" title="Permalink to this definition">¶</a></dt>
<dd><p>Always copy files rather than symlinking.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-relocatable">
<code class="descname">--relocatable</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-relocatable" title="Permalink to this definition">¶</a></dt>
<dd><p>Make an EXISTING virtualenv environment relocatable.
This fixes up scripts and makes all .pth files relative.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-unzip-setuptools">
<code class="descname">--unzip-setuptools</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-unzip-setuptools" title="Permalink to this definition">¶</a></dt>
<dd><p>Unzip Setuptools when installing it.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-no-setuptools">
<code class="descname">--no-setuptools</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-no-setuptools" title="Permalink to this definition">¶</a></dt>
<dd><p>Do not install setuptools in the new virtualenv.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-no-pip">
<code class="descname">--no-pip</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-no-pip" title="Permalink to this definition">¶</a></dt>
<dd><p>Do not install pip in the new virtualenv.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-no-wheel">
<code class="descname">--no-wheel</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-no-wheel" title="Permalink to this definition">¶</a></dt>
<dd><p>Do not install wheel in the new virtualenv.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-extra-search-dir">
<code class="descname">--extra-search-dir</code><code class="descclassname">=DIR</code><a class="headerlink" href="#cmdoption-extra-search-dir" title="Permalink to this definition">¶</a></dt>
<dd><p>Directory to look for setuptools/pip distributions in.
This option can be specified multiple times.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-prompt">
<code class="descname">--prompt</code><code class="descclassname">=PROMPT</code><a class="headerlink" href="#cmdoption-prompt" title="Permalink to this definition">¶</a></dt>
<dd><p>Provides an alternative prompt prefix for this
environment.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-download">
<code class="descname">--download</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-download" title="Permalink to this definition">¶</a></dt>
<dd><p>Download preinstalled packages from PyPI.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-no-download">
<code class="descname">--no-download</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-no-download" title="Permalink to this definition">¶</a></dt>
<dd><p>Do not download preinstalled packages from PyPI.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-no-site-packages">
<code class="descname">--no-site-packages</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-no-site-packages" title="Permalink to this definition">¶</a></dt>
<dd><p>DEPRECATED. Retained only for backward compatibility.
Not having access to global site-packages is now the
default behavior.</p>
</dd></dl>
<dl class="option">
<dt id="cmdoption-distribute">
<code class="descname">--distribute</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-distribute" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="option">
<dt id="cmdoption-setuptools">
<code class="descname">--setuptools</code><code class="descclassname"></code><a class="headerlink" href="#cmdoption-setuptools" title="Permalink to this definition">¶</a></dt>
<dd><p>Legacy; now have no effect. Before version 1.10 these could be used
to choose whether to install <a class="reference external" href="https://pypi.org/project/distribute">Distribute</a> or <a class="reference external" href="https://pypi.org/project/setuptools">Setuptools</a> into the created
virtualenv. Distribute has now been merged into Setuptools, and the
latter is always installed.</p>
</dd></dl>
</div>
</div>
<div class="section" id="configuration">
<h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">¶</a></h2>
<div class="section" id="environment-variables">
<h3>Environment Variables<a class="headerlink" href="#environment-variables" title="Permalink to this headline">¶</a></h3>
<p>Each command line option is automatically used to look for environment
variables with the name format <code class="docutils literal notranslate"><span class="pre">VIRTUALENV_<UPPER_NAME></span></code>. That means
the name of the command line options are capitalized and have dashes
(<code class="docutils literal notranslate"><span class="pre">'-'</span></code>) replaced with underscores (<code class="docutils literal notranslate"><span class="pre">'_'</span></code>).</p>
<p>For example, to automatically use a custom Python binary instead of the
one virtualenv is run with you can also set an environment variable:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ export VIRTUALENV_PYTHON=/opt/python-3.3/bin/python
$ virtualenv ENV
</pre></div>
</div>
<p>It’s the same as passing the option to virtualenv directly:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ virtualenv --python=/opt/python-3.3/bin/python ENV
</pre></div>
</div>
<p>This also works for appending command line options, like <code class="docutils literal notranslate"><span class="pre">--find-links</span></code>.
Just leave an empty space between the passed values, e.g.:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ export VIRTUALENV_EXTRA_SEARCH_DIR="/path/to/dists /path/to/other/dists"
$ virtualenv ENV
</pre></div>
</div>
<p>is the same as calling:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ virtualenv --extra-search-dir=/path/to/dists --extra-search-dir=/path/to/other/dists ENV
</pre></div>
</div>
<dl class="envvar">
<dt id="envvar-VIRTUAL_ENV_DISABLE_PROMPT">
<code class="descname">VIRTUAL_ENV_DISABLE_PROMPT</code><a class="headerlink" href="#envvar-VIRTUAL_ENV_DISABLE_PROMPT" title="Permalink to this definition">¶</a></dt>
<dd><p>Any virtualenv created when this is set to a non-empty value will not have
it’s <a class="reference internal" href="userguide.html#activate"><span class="std std-ref">activate script</span></a> modify the shell prompt.</p>
</dd></dl>
</div>
<div class="section" id="configuration-file">
<h3>Configuration File<a class="headerlink" href="#configuration-file" title="Permalink to this headline">¶</a></h3>
<p>virtualenv also looks for a standard ini config file. On Unix and Mac OS X
that’s <code class="docutils literal notranslate"><span class="pre">$HOME/.virtualenv/virtualenv.ini</span></code> and on Windows, it’s
<code class="docutils literal notranslate"><span class="pre">%APPDATA%\virtualenv\virtualenv.ini</span></code>.</p>
<p>The names of the settings are derived from the long command line option,
e.g. the option <a class="reference internal" href="#cmdoption-p"><code class="xref std std-option docutils literal notranslate"><span class="pre">--python</span></code></a> would look like this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">virtualenv</span><span class="p">]</span>
<span class="n">python</span> <span class="o">=</span> <span class="o">/</span><span class="n">opt</span><span class="o">/</span><span class="n">python</span><span class="o">-</span><span class="mf">3.3</span><span class="o">/</span><span class="nb">bin</span><span class="o">/</span><span class="n">python</span>
</pre></div>
</div>
<p>Appending options like <a class="reference internal" href="#cmdoption-extra-search-dir"><code class="xref std std-option docutils literal notranslate"><span class="pre">--extra-search-dir</span></code></a> can be written on multiple
lines:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">virtualenv</span><span class="p">]</span>
<span class="n">extra</span><span class="o">-</span><span class="n">search</span><span class="o">-</span><span class="nb">dir</span> <span class="o">=</span>
<span class="o">/</span><span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">dists</span>
<span class="o">/</span><span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">other</span><span class="o">/</span><span class="n">dists</span>
</pre></div>
</div>
<p>Please have a look at the output of <a class="reference internal" href="#cmdoption-h"><code class="xref std std-option docutils literal notranslate"><span class="pre">--help</span></code></a> for a full list
of supported options.</p>
</div>
</div>
<div class="section" id="extending-virtualenv">
<h2>Extending Virtualenv<a class="headerlink" href="#extending-virtualenv" title="Permalink to this headline">¶</a></h2>
<div class="section" id="creating-your-own-bootstrap-scripts">
<h3>Creating Your Own Bootstrap Scripts<a class="headerlink" href="#creating-your-own-bootstrap-scripts" title="Permalink to this headline">¶</a></h3>
<p>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.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">A bootstrap script requires a <code class="docutils literal notranslate"><span class="pre">virtualenv_support</span></code> directory containing
<code class="docutils literal notranslate"><span class="pre">pip</span></code> and <code class="docutils literal notranslate"><span class="pre">setuptools</span></code> wheels alongside it, just like the actual virtualenv
script. Running a bootstrap script without a <code class="docutils literal notranslate"><span class="pre">virtualenv_support</span></code> directory
is unsupported (but if you use <code class="docutils literal notranslate"><span class="pre">--no-setuptools</span></code> and manually install <code class="docutils literal notranslate"><span class="pre">pip</span></code>
and <code class="docutils literal notranslate"><span class="pre">setuptools</span></code> in your virtualenv, it will work).</p>
</div>
<p>To create a script like this, call
<code class="xref py py-func docutils literal notranslate"><span class="pre">virtualenv.create_bootstrap_script()</span></code>, and write the
result to your new bootstrapping script.</p>
<dl class="function">
<dt id="create_bootstrap_script">
<code class="descname">create_bootstrap_script</code><span class="sig-paren">(</span><em>extra_text</em><span class="sig-paren">)</span><a class="headerlink" href="#create_bootstrap_script" title="Permalink to this definition">¶</a></dt>
<dd><p>Creates a bootstrap script from <code class="docutils literal notranslate"><span class="pre">extra_text</span></code>, which is like
this script but with extend_parser, adjust_options, and after_install hooks.</p>
</dd></dl>
<p>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 virtualenv.py script, with your extra text
added (your extra text should be Python code).</p>
<p>If you include these functions, they will be called:</p>
<dl class="function">
<dt id="extend_parser">
<code class="descname">extend_parser</code><span class="sig-paren">(</span><em>optparse_parser</em><span class="sig-paren">)</span><a class="headerlink" href="#extend_parser" title="Permalink to this definition">¶</a></dt>
<dd><p>You can add or remove options from the parser here.</p>
</dd></dl>
<dl class="function">
<dt id="adjust_options">
<code class="descname">adjust_options</code><span class="sig-paren">(</span><em>options</em>, <em>args</em><span class="sig-paren">)</span><a class="headerlink" href="#adjust_options" title="Permalink to this definition">¶</a></dt>
<dd><p>You can change options here, or change the args (if you accept
different kinds of arguments, be sure you modify <code class="docutils literal notranslate"><span class="pre">args</span></code> so it is
only <code class="docutils literal notranslate"><span class="pre">[DEST_DIR]</span></code>).</p>
</dd></dl>
<dl class="function">
<dt id="after_install">
<code class="descname">after_install</code><span class="sig-paren">(</span><em>options</em>, <em>home_dir</em><span class="sig-paren">)</span><a class="headerlink" href="#after_install" title="Permalink to this definition">¶</a></dt>
<dd><p>After everything is installed, this function is called. This
is probably the function you are most likely to use. An
example would be:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">after_install</span><span class="p">(</span><span class="n">options</span><span class="p">,</span> <span class="n">home_dir</span><span class="p">):</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">platform</span> <span class="o">==</span> <span class="s1">'win32'</span><span class="p">:</span>
<span class="nb">bin</span> <span class="o">=</span> <span class="s1">'Scripts'</span>
<span class="k">else</span><span class="p">:</span>
<span class="nb">bin</span> <span class="o">=</span> <span class="s1">'bin'</span>
<span class="n">subprocess</span><span class="o">.</span><span class="n">call</span><span class="p">([</span><span class="n">join</span><span class="p">(</span><span class="n">home_dir</span><span class="p">,</span> <span class="nb">bin</span><span class="p">,</span> <span class="s1">'easy_install'</span><span class="p">),</span>
<span class="s1">'MyPackage'</span><span class="p">])</span>
<span class="n">subprocess</span><span class="o">.</span><span class="n">call</span><span class="p">([</span><span class="n">join</span><span class="p">(</span><span class="n">home_dir</span><span class="p">,</span> <span class="nb">bin</span><span class="p">,</span> <span class="s1">'my-package-script'</span><span class="p">),</span>
<span class="s1">'setup'</span><span class="p">,</span> <span class="n">home_dir</span><span class="p">])</span>
</pre></div>
</div>
<p>This example immediately installs a package, and runs a setup
script from that package.</p>
</dd></dl>
</div>
<div class="section" id="bootstrap-example">
<h3>Bootstrap Example<a class="headerlink" href="#bootstrap-example" title="Permalink to this headline">¶</a></h3>
<p>Here’s a more concrete example of how you could use this:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">virtualenv</span><span class="o">,</span> <span class="nn">textwrap</span>
<span class="n">output</span> <span class="o">=</span> <span class="n">virtualenv</span><span class="o">.</span><span class="n">create_bootstrap_script</span><span class="p">(</span><span class="n">textwrap</span><span class="o">.</span><span class="n">dedent</span><span class="p">(</span><span class="s2">"""</span>
<span class="s2">import os, subprocess</span>
<span class="s2">def after_install(options, home_dir):</span>
<span class="s2"> etc = join(home_dir, 'etc')</span>
<span class="s2"> if not os.path.exists(etc):</span>
<span class="s2"> os.makedirs(etc)</span>
<span class="s2"> subprocess.call([join(home_dir, 'bin', 'easy_install'),</span>
<span class="s2"> 'BlogApplication'])</span>
<span class="s2"> subprocess.call([join(home_dir, 'bin', 'paster'),</span>
<span class="s2"> 'make-config', 'BlogApplication',</span>
<span class="s2"> join(etc, 'blog.ini')])</span>
<span class="s2"> subprocess.call([join(home_dir, 'bin', 'paster'),</span>
<span class="s2"> 'setup-app', join(etc, 'blog.ini')])</span>
<span class="s2">"""</span><span class="p">))</span>
<span class="n">f</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s1">'blog-bootstrap.py'</span><span class="p">,</span> <span class="s1">'w'</span><span class="p">)</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">output</span><span class="p">)</span>
</pre></div>
</div>
<p>Another example is available <a class="reference external" href="https://github.com/socialplanning/fassembler/blob/master/fassembler/create-venv-script.py">here</a>.</p>
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