Actually, this is a Python 2.7/3.x issue; the issue is with the function that the FunctionCV is wrapping around. See https://docs.python.org/3/whatsnew/3.0.html#operators-and-special-methods. We still support Python 2.7, so this should be set up in a way that works in both 2.7 and 3.x. You probably need something like this (at the top of the file; module-level):

if sys.version_info > (3, ):
    get_callable_name = lambda c: c.__name__
else:
    get_callable_name = lambda c: c.func_name

(then use get_callable_name to get the name).

Also, I assume that you found this because something happened that raised an error message (since this is in an error message). I just wrote up some docs on making CVs that will, I hope, make it a little clearer! See #831.

Yes. I was not importing the modules. Thanks for that link!.

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The changes in this pull request are licensed under the MIT license.