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  1. PO
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    <p>Create your own:</p> <pre><code>def noop(*args, **kw): pass </code></pre> <p>This takes any number of positional and keyword arguments and does nothing at all. <a href="http://docs.python.org/2/reference/simple_stmts.html#grammar-token-pass_stmt" rel="nofollow noreferrer"><code>pass</code> signifies an empty python block</a>; it works anywhere Python expects a <code>block</code>, including loops, <code>if</code> statements and <code>try</code> statements.</p> <p>Python callables always return <em>something</em> (it is a language requirement); if no explicit return value is given <code>None</code> is returned.</p> <p>The <code>*</code> and <code>**</code> indicate arbitrary length parameters; you can pass in 0 or more positional parameters and the <code>args</code> name will represent a tuple of them, and 0 or more keyword arguments, and they are captured in the <code>kw</code> dictionary.</p> <p>From the <a href="http://docs.python.org/2/reference/compound_stmts.html#function-definitions" rel="nofollow noreferrer">function definition documentation</a>:</p> <blockquote> <p>If the form “<code>*identifier</code>” is present, it is initialized to a tuple receiving any excess positional parameters, defaulting to the empty tuple. If the form “<code>**identifier</code>” is present, it is initialized to a new dictionary receiving any excess keyword arguments, defaulting to a new empty dictionary.</p> </blockquote> <p>Simple demo of <code>*</code> and <code>**</code> parameters:</p> <pre><code>&gt;&gt;&gt; def f(*args, **kw): return (args, kw) ... &gt;&gt;&gt; f('foo', 'bar', spam='eggs', monty='python') (('foo', 'bar'), {'monty': 'python', 'spam': 'eggs'}) </code></pre> <p>For functional programming, if you need the arguments to be returned <em>as is</em> you need to think about what you need returning; a one-argument function would return just that argument and for anything that needs to take 2 or more arguments and return them all, you'd have to return those arguments as a tuple:</p> <pre><code>def identity(arg): return arg def plural_identity(*args): return args </code></pre> <p>Demo:</p> <pre><code>&gt;&gt;&gt; identity('foobar') 'foobar' &gt;&gt;&gt; plural_identity('spam', 'eggs') ('spam', 'eggs') </code></pre>
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    1. POIs there a standard Python function that takes any number of arguments and does nothing?
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    1. PTAnswer
    1. USMartijn Pieters
    1. USMartijn Pieters
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    1. POIs there a standard Python function that takes any number of arguments and does nothing?
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    1. VO
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      1. This table or related slice is empty.
      1. VTUpMod
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    1. COYou could do it as a lambda too, if that is more friendly to the context.
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      1. USSilas Ray
    2. CODoes this really do nothing? It returns `None` which is in fact doing *something*. Of course, I think OP might need to give a little more information on what doing *nothing* actually means... (anyway, +1 ... I think this is probably the best answer you could give to this question)
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      1. USmgilson
    3. COa function can't do any less than that, in python... unless it has a time machine I guess.
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      1. USElazar
 

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