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POIs it ever polite to put code in a python configuration file?
 

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  1. POIs it ever polite to put code in a python configuration file?
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    <p>One of my favorite features about python is that you can write configuration files in python that are very simple to read and understand. If you put a few boundaries on yourself, you can be pretty confident that non-pythonistas will know exactly what you mean and will be perfectly capable of reconfiguring your program.</p> <p>My question is, what exactly are those boundaries? My own personal heuristic was</p> <ol> <li>Avoid flow control. No functions, loops, or conditionals. Those wouldn't be in a text config file and people aren't expecting to have understand them. In general, it probably shouldn't matter the order in which your statements execute.</li> <li>Stick to literal assignments. Methods and functions called on objects are harder to think through. Anything implicit is going to be a mess. If there's something complicated that has to happen with your parameters, change how they're interpreted.</li> <li>Language keywords and error handling are right out.</li> </ol> <p>I guess I ask this because I came across a situation with my Django config file where it seems to be useful to break these rules. I happen to like it, but I feel a little guilty. Basically, my project is deployed through svn checkouts to a couple different servers that won't all be configured the same (some will share a database, some won't, for example). So, I throw a hook at the end:</p> <pre><code>try: from settings_overrides import * LOCALIZED = True except ImportError: LOCALIZED = False </code></pre> <p>where settings_overrides is on the python path but outside the working copy. What do you think, either about this example, or about python config boundaries in general?</p>
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    1. USAdam Davis
    1. USDavid Berger
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    1. CO"change how their interpreted" -> "change how they're interpreted". I know it doesn't matter, but it's a pet peeve...
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      1. UStgray
    2. COThanks. I feel so ashamed.
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      1. USDavid Berger
 

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