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POHow to properly handle a circular module dependency in Python?
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  1. POHow to properly handle a circular module dependency in Python?
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    copied!<p>Trying to find a good and proper pattern to handle a circular module dependency in Python. Usually, the solution is to remove it (through refactoring); however, in this particular case we would really like to have the functionality that requires the circular import.</p> <p><strong>EDIT</strong>: According to answers below, the usual angle of attack for this kind of issue would be a refactor. However, for the sake of this question, assume that is not an option (for whatever reason).</p> <p><strong>The problem:</strong></p> <p>The <code>logging</code> module requires the <code>configuration</code> module for some of its configuration data. However, for some of the <code>configuration</code> functions I would really like to use the custom logging functions that are defined in the <code>logging</code> module. Obviously, importing the <code>logging</code> module in <code>configuration</code> raises an error.</p> <p><strong>The possible solutions we can think of:</strong></p> <ol> <li><p><strong>Don't do it</strong>. As I said before, this is not a good option, unless all other possibilities are ugly and bad.</p></li> <li><p><strong>Monkey-patch the module</strong>. This doesn't sound too bad: load the <code>logging</code> module dynamically into <code>configuration</code> <em>after</em> the initial import, and before any of its functions are actually used. This implies defining global, per-module variables, though.</p></li> <li><p><strong>Dependency injection</strong>. I've read and run into dependency injection alternatives (particularly in the Java Enterprise space) and they remove some of this headache; however, they may be too complicated to use and manage, which is something we'd like to avoid. I'm not aware of how the panorama is about this in Python, though.</p></li> </ol> <p>What is a good way to enable this functionality?</p> <p>Thanks very much!</p>
 

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