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    <p>If you want to assert that it's actually a function, that's easy:</p> <pre><code>assert ininstance(dist_fun, types.FunctionType) </code></pre> <p>… or:</p> <pre><code>assert inspect.isfunction(dist_fun) </code></pre> <p>In general, when you have this problem:</p> <blockquote> <p>I've seen that the "type" of a function is "function", but Python does not allow me to use this as a type?</p> </blockquote> <p>… for a built-in type, the type you want is available in <a href="http://docs.python.org/2/library/types.html" rel="nofollow"><code>types</code></a> and/or a function that checks more simply can be found in <a href="http://docs.python.org/3/library/types.html" rel="nofollow"><code>inspect</code></a>.</p> <hr> <p>However, you probably don't want to do that; rather, you want to assert that it's <em>something callable</em>. After all, a bound method, a <code>functools.partial</code>, an object with a custom <code>__call__</code> method, a custom function-like object implemented in a C extension, etc. would all be just as useful here, right? So use <a href="http://docs.python.org/2/library/functions.html#callable" rel="nofollow"><code>callable</code></a>:</p> <pre><code>assert callable(dist_fun) </code></pre> <p>(Unless you need to support Python 3.0-3.1, or really ancient 1.x versions. <code>callable</code> was added somewhere around 1.4, removed in 3.0, then added back in 3.2.)</p> <hr> <p>Or, maybe even better (with Python 3.3+ only):</p> <pre><code>assert inspect.signature(dist_fun).bind(p1, p2) </code></pre> <p>This checks that it's not just callable, but callable with the arguments you want to pass it. (Not such a big deal when it's just two positional arguments… but when you're passing keyword arguments, or forwarding args with <em>/</em>*, etc., it can be.)</p>
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    1. POAsserting something is a valid function in Python
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    1. COI didn't know about "types" at all --- this is pretty neat. I also didn't know about __call__, but I'm sure there's some pretty cool stuff that I can do with that when I start doing a bit more under-the-hood work. Neat.
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    2. CO@james: Take a look at `inspect` while you're at it. Especially if you are (or are considering) using 3.3+, where you can use `inspect.signature(dist_fun)` and assert that it will take the arguments you want to pass it.
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