Doc strings in descriptors

[Kevin D. Smith]

I have a simple descriptor to create a cached property as shown below.

class cproperty(object):
    """ Property whose value is only calculated once and cached """
    def __init__(self, func):
        self._func = func
        self.__doc__ = func.__doc__
    def __get__(self, obj, type=None):
        if obj is None:
            return self
        try:
            return getattr(obj, '@%s' % self._func.func_name)
        except AttributeError:
            result = self._func(obj)
            setattr(obj, '@%s' % self._func.func_name, result)
            return result

The problem is that when I use the help() function on them, I don't get 
the doc string from the function that is being wrapped.  Instead, I get 
the following:

    hasEmployees = <StudioManager.utils.cproperty object at 0xf126f0>

What do I need to do to get the doc string of the wrapped function to 
apper when using help()?

-- 
Kevin D. Smith