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    <p>A common approach is ship a <a href="http://www.pip-installer.org/en/latest/requirements.html" rel="nofollow">requirements file</a> with a project, specifying which version of which library is required. This file is (by convention) often named <code>requirements.txt</code> and looks something like this:</p> <pre><code>MyApp BeautifulSoup==3.2.1 SomeOtherLib==0.9.4 YetAnother&gt;=0.2 </code></pre> <p>(The fictional file above says: I need exactly BeautifulSoup 3.2.1, SomeOtherLib 0.9.4 and any version of YetAnother greater or equal to 0.2).</p> <p>Then the user of this project can simply take you library, (create a <a href="http://iamzed.com/2009/05/07/a-primer-on-virtualenv/" rel="nofollow">virtualenv</a>) and run</p> <pre><code>$ pip install -r requirements.txt </code></pre> <p>which then will fetch all libraries and makes them available either system-wide of project-wide (if virtualenv is used). Here's a random python project off github, having a requirements file: </p> <ul> <li><a href="https://github.com/laoqiu/pypress" rel="nofollow">https://github.com/laoqiu/pypress</a></li> <li><a href="https://github.com/laoqiu/pypress/blob/master/requirements.txt" rel="nofollow">https://github.com/laoqiu/pypress/blob/master/requirements.txt</a></li> </ul> <p>The nice thing about this approach is that you'll get your transitive dependencies resolved automatically. Also, if you use virtualenv, you'll get a clean separation of your projects and avoid library version collisions.</p>
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    1. POHow to import libraries from source code in python?
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    1. COWhat is >=?, Also the command pip freeze > requirements.txt to save your current requirements, might be useful.
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      1. USDrew Verlee
    2. CO@DrewV, I added a short note on `==` and `>=`.
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    3. COThis helps a lot. Thanks a lot to all who posted!
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