access __doc__ from within function without reference to function name

[SanPy]

The subject of this message might be a little cryptic, so here's an
example of what I mean:

def foo():
    """doc string of foo"""
    print foo.__doc__

>>> foo()
doc string of foo

What I want to know is whether it is possible to call __doc__ against
some builtin method, like __func__ or something like that. So calling
__doc__ without the functions name, something like this:

def foo():
    """doc string of foo"""
    print __func__.__doc__ # pseudo code

So basically, my question is: is there a way to access a function from
within itself without using its name?

Regards, Sander.