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    <p>You can't do that "function accessing its own attributes" correctly for all situations - see for details here <a href="https://stackoverflow.com/questions/3109289/how-can-python-function-access-its-own-attributes">how can python function access its own attributes?</a> - but here is a quick demonstration:</p> <pre><code>&gt;&gt;&gt; def f(): return f.x ... &gt;&gt;&gt; f.x = 7 &gt;&gt;&gt; f() 7 &gt;&gt;&gt; g = f &gt;&gt;&gt; g() 7 &gt;&gt;&gt; del f &gt;&gt;&gt; g() Traceback (most recent call last): File "&lt;interactive input&gt;", line 1, in &lt;module&gt; File "&lt;interactive input&gt;", line 1, in f NameError: global name 'f' is not defined </code></pre> <p>Basically most methods directly or indirectly rely on accessing the function object through lookup by name in globals; and if original function name is deleted, this stops working. There are other kludgey ways of accomplishing this, like defining class, or factory - but thanks to your explanation it is clear you don't really need that.</p> <p>Just do the mentioned keyword catch-all argument, like so:</p> <pre><code>def fn1(oneArg): // do the due def fn2(oneArg, **kw): if 'option1' in kw: print 'called with option1=', kw['option1'] //do the rest fn2(42) fn2(42, option1='something') </code></pre> <p>Not sure what you mean in your comment of handling TypeError - that won't arise when using **kw. This approach works very well for some python system functions - check min(), max(), sort(). Recently <code>sorted(dct,key=dct.get,reverse=True)</code> came very handy to me in CodeGolf challenge :)</p>
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    1. COIt will arise if I omit `**kw`. I have some older functions that only accept one argument. If I pass a whole bunch to them, they'll throw a `TypeError`. I can catch the exception and then call the function again, but with only one arg. Anyway, this is a pretty thorough answer, and you put a nice warning in there that others didn't mention. Didn't realize I hadn't awarded this question yet...so congrats!
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    2. COThank you. Well perhaps you can inject the "missing" argument in the definition of older fn with the help of decorator, like in this newly posted answer http://stackoverflow.com/questions/3109289#3209862
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