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copied!<p><a href="http://docs.python.org/library/functions.html#locals" rel="noreferrer"><code>locals()</code></a> may be your friend here if you call it first thing in your function.</p> <p><strong>Example 1</strong>:</p> <pre><code>>>> def fun(a, b, c): ... d = locals() ... e = d ... print e ... print locals() ... >>> fun(1, 2, 3) {'a': 1, 'c': 3, 'b': 2} {'a': 1, 'c': 3, 'b': 2, 'e': {...}, 'd': {...}} </code></pre> <p><strong>Example 2</strong>:</p> <pre><code>>>> def nones(a, b, c, d): ... arguments = locals() ... print 'The following arguments are not None: ', ', '.join(k for k, v in arguments.items() if v is not None) ... >>> nones("Something", None, 'N', False) The following arguments are not None: a, c, d </code></pre> <p><strong>Answer</strong>:</p> <pre><code>>>> def foo(a, b, c): ... return ''.join(v for v in locals().values() if v is not None) ... >>> foo('Cleese', 'Palin', None) 'CleesePalin' </code></pre> <p><strong>Update</strong>:</p> <p>'Example 1' highlights that we may have some extra work to do if the order of your arguments is important as the <code>dict</code> returned by <code>locals()</code> (or <code>vars()</code>) is unordered. The function above also doesn't deal with numbers very gracefully. So here are a couple of refinements:</p> <pre><code>>>> def foo(a, b, c): ... arguments = locals() ... return ''.join(str(arguments[k]) for k in sorted(arguments.keys()) if arguments[k] is not None) ... >>> foo(None, 'Antioch', 3) 'Antioch3' </code></pre>

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