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    <p>Yes. Django is just a regular Python module living in your <strong>site-packages</strong>. So when you <code>import django.something</code>, the way Python decides which version to load is by walking down the Python path (<code>import sys; print sys.path</code>) in order and looking for a directory called django (with <strong>something.py</strong> or <strong>something/_<em>init</em>_.py</strong> inside). It loads the first one it finds. So the quickest method is to modify this Python path before starting your project, which can be conveniently done with an environment variable named PYTHONPATH.</p> <p>So for your Django 1.2 project, install Django 1.2 in site-packages/django-1.2 and then:</p> <pre><code># run Django 1.2 for old app that I don't have time to update cd ~gaearon/src/old-django-project env PYTHONPATH=/Library/Python/2.6/site-packages/django-1.2 ./manage.py runserver </code></pre> <p>For all other (Django 1.3) projects, simply install Django as normal, which makes it the default:</p> <pre><code># all other projects use the system default Django 1.3 cd ~gaearon/src/current-django-project ./manage.py runserver </code></pre> <p>For production servers you won't use runserver, but the PYTHONPATH will work wherever you invoke Python (i.e. flup, or manage.py runfcgi). If invoked from mod_python there is an Apache configuration directive to modify the Python path (see mod_python documentation).</p> <p>Or you could use <a href="http://www.virtualenv.org/en/latest/index.html#what-it-does" rel="nofollow">virtualenv</a>.</p>
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    1. POIs there a way to install Django 1.2 and 1.3 side by side?
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    1. USIngmar Hupp
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    1. COThis is indeed an option, but a bit more complicated one. Whenever you're working on Django 1.2, don't forget to set the PATH correctly with something like `export PATH=/Library/Python/2.6/site-packages/django-1.2/bin:$PATH` so that you run the correct django-admin script for creating a 1.2 project. This isn't necessary for ./manage.py thou.
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      1. USFelipeFG
    2. CO@Igmar: thanks for the thorough answer. However I use Apache with mod_wsgi, not `runserver`. Is there a way to configure it this way?
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      1. USDan Abramov
    3. CO@FelipeFD: I have an *existing* project, I don't need to create a new one..
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      1. USDan Abramov
 

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