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    <p>By applying a suspected decorator, catching exceptions, and then testing whether the result contains a <code>__call__</code> method, you could produce a guess as to whether a given callable is a decorator or not. But it will be only a guess, not a guarantee.</p> <p>Beyond that, I do not believe what you want will be possible in general, due to the dynamically typed nature of the Python language and to the special treatment of built-in functions in the CPython interpreter. It is not possible to programmatically tell whether a callable will accept another callable as an argument, or what type its return value will have. Also, in CPython, for functions implemented in C, you cannot even inspect a callable to see how many arguments it accepts.</p> <p>The word "decorator" can be taken to mean different things. One way to define it is, a decorator is any callable that accepts a single (callable) argument and returns a callable.</p> <p>Note that I have not even used the word "function" in this definition; it would actually be incorrect to do so. Indeed, some commonly used decorators have strange properties:</p> <ul> <li>The built-in <code>classmethod</code> and <code>staticmethod</code> decorators return descriptor objects, not functions.</li> <li>Since language version 2.6 you can decorate classes, not just functions and methods.</li> <li>Any class containing an <code>__init__(self, somecallable)</code> method and a <code>__call__(self, *args, **kwargs)</code> method can be used as a decorator.</li> </ul>
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    1. POHow can I see if a method is a decorator?
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    1. COThanks - your statement that a decorator can be "[a] callable that accepts a single callable argument and returns a callable" would be the basis for my test and should be enough for validation as this is how they should be created in the 3rd-party code. However, judging by the complexity, I'm just going to try and provide some nice error messages instead. :D
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      1. USPhillip B Oldham
 

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