Remove all decorators from a function, method or class

def undecorated(o):
    """Remove all decorators from a function, method or class"""
    # class decorator
    if type(o) is type:
        return o

    try:
        # python2
        closure = o.func_closure
    except AttributeError:
        pass

    try:
        # python3
        closure = o.__closure__
    except AttributeError:
        return

    if closure:
        for cell in closure:
            # avoid infinite recursion
            if cell.cell_contents is o:
                continue

            # check if the contents looks like a decorator; in that case
            # we need to go one level down into the dream, otherwise it
            # might just be a different closed-over variable, which we
            # can ignore.

            # Note: this favors supporting decorators defined without
            # @wraps to the detriment of function/method/class closures
            if looks_like_a_decorator(cell.cell_contents):
                undecd = undecorated(cell.cell_contents)
                if undecd:
                    return undecd
        else:
            return o
    else:
        return o