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POHow to modularize a Python application
 

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    <p>I've got a number of scripts that use common definitions. How do I split them in multiple files? Furthermore, the application can not be installed in any way in my scenario; it must be possible to have an arbitrary number of versions concurrently running and it must work without superuser rights. Solutions I've come up with are:</p> <ul> <li><b>Duplicate code</b> in every script. Messy, and probably the worst scheme.</li> <li><b>Put all scripts and common code in a single directory,</b> and use <code>from . import</code> to load them. The downside of this approach is that I'd like to put my libraries in other directory than the applications.</li> <li><b>Put common code in its own directory</b>, write a <code>__init__.py</code> that imports all submodules and finally use <code>from . import</code> to load them. Keeps code organized, but it's a little bit of overhead to maintain <code>__init__.py</code> and qualify names.</li> <li><b>Add the library directory to <code>sys.path</code> and <code>import</code>.</b> I tend to this, but I'm not sure whether fiddling with <code>sys.path</code> is nice code.</li> <li><b>Load using <code>execfile</code></b> (<code>exec</code> in Python 3). Combines the advantages of the previous two approaches: Only one line per module needed, and I can use a dedicated. On the other hand, this evades the python module concept and polutes the global namespace.</li> <li><b>Write and install a module using <code>distutils</code>.</b> This installs the library for all python scripts and needs superuser rights and impacts other applications and is hence not applicable in my case.</li> </ul> <p>What is the best method?</p>
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