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I have a wrapper function that returns a function. Is there a way to programmatically set the docstring of the returned function? If I could write to __doc__ I'd do the following: def wrapper(a): def add_something(b): return a + b add_something.__doc__ = 'Adds ' + str(a) + ' to `b`' return add_something Then I could do >>> add_three = wrapper(3) >>> add_three.__doc__ 'Adds 3 to `b` However, since __doc__ is read-only, I can't do that. What's the correct way? Edit: Ok, I wanted to keep this simple, but of course this is not what I'm actually trying to do. Even though in general __doc__ is writeable in my case it isn't. I am trying to create testcases for unittest automatically. I have a wrapper function that creates a class object that is a subclass of unittest.TestCase : import unittest def makeTestCase(filename, my_func): class ATest(unittest.TestCase): def testSomething(self): # Running test in here with data in filename and function my_func data = loadmat(filename) result = my_func(data) self.assertTrue(result > 0) return ATest If I create this class and try to set the docstring of testSomething I get an error: >>> def my_func(): pass >>> MyTest = makeTestCase('some_filename', my_func) >>> MyTest.testSomething.__doc__ = 'This should be my docstring' AttributeError: attribute '__doc__' of 'instancemethod' objects is not writable

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