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copied!<p>The following code works. It checks for the special case of a single key having a period in it. Then, it splits the key apart. For each subkey, it tries to fetch the value from a list-like context, then it tries from a dictionary-type context, then it gives up.</p> <p>This code also shows how to use unittest/nose, which is <em>highly</em> recommended. Test with "nosetests mysource.py".</p> <p>Lastly, consder using Python's built-in ConfigParser class, which is really useful for this type of configuration task: <a href="http://docs.python.org/library/configparser.html" rel="nofollow noreferrer">http://docs.python.org/library/configparser.html</a></p> <pre><code>#!/usr/bin/env python from nose.tools import eq_, raises context = { 'database': { 'port': 9990, 'users': ['number2', 'dr_evil'] }, 'admins': ['number2@virtucon.com', 'dr_evil@virtucon.com'], 'domain.name': 'virtucon.com' } def getitem(key, context): if isinstance(context, dict) and context.has_key(key): return context[key] for key in key.split('.'): try: context = context[int(key)] continue except ValueError: pass if isinstance(context, dict) and context.has_key(key): context = context[key] continue raise KeyError, key return context def test_getitem(): eq_( getitem('database', context), {'port': 9990, 'users': ['number2', 'dr_evil']} ) eq_( getitem('database.port', context), 9990 ) eq_( getitem('database.users.0', context), 'number2' ) eq_( getitem('admins', context), ['number2@virtucon.com', 'dr_evil@virtucon.com'] ) eq_( getitem('domain.name', context), 'virtucon.com' ) @raises(KeyError) def test_getitem_error(): getitem('database.nosuchkey', context) </code></pre>

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