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POpython: How to check extra requirements at runtime?
 

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    <p>Our main application has some extra features, that users can enable. Those features are in their own directory. Those features might need extra dependencies. I am considering to put those in a <code>requires.txt</code> file there. At runtime, we would like to let people know, if the feature will break. I am currently considering something like this:</p> <pre><code>def checkfeature(feature): everything_okay = True f = pkg_resources.resource_stream(feature, "requires.txt") with f: for r in pkg_resources.parse_requirements(f): if pkg_resources.working_set.find(r) is None: print "%r not found, please install, otherwise this feature does not work" % (r,) everything_okay = False return everything_okay </code></pre> <p>Is this the right, pythonic way of doing things? Does this make sense?</p> <p>Small update: Why so complex and not just <code>try: import ... except ImportError: ...</code> like suggested in one answer:</p> <ol> <li>Our plugins might have a bunch of dependencies. Creating actual code like the one below is quite verbose.</li> <li>Some plugins might need a specific version of a package. Testing that requires either a pakcage specific test or using <code>pkg_resources</code> anyway. So that's why my idea above uses pkg_resources.</li> <li>We want to run unit tests for plugins that can be run. Handling the ImportError in the unit tests is not nice. Having a <code>can_we_unit_test_this_plugin(plugin)</code> function makes things easier.</li> </ol> <p>Second update: What about <code>extra_require</code> in <code>setup.py</code>?</p> <ol> <li>people miss to install those often. Okay, bad excuse.</li> <li>My vision is, that <code>setup.py</code> loads the <code>extra_require</code> straight from the above mentioned <code>requires.txt</code> in the individual subdirs for the individual features. But that's really the next step.</li> </ol>
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