def METHOD_NAME(self, expression):
    """Return the argument list and docstring of a function or class
    If there is a Python subprocess, get the calltip there.  Otherwise,
    either fetch_tip() is running in the subprocess itself or it was called
    in an IDLE EditorWindow before any script had been run.
    The subprocess environment is that of the most recently run script.  If
    two unrelated modules are being edited some calltips in the current
    module may be inoperative if the module was not the last to run.
    To find methods, fetch_tip must be fed a fully qualified name.
    """
    try:
        rpcclt = self.editwin.flist.pyshell.interp.rpcclt
    except AttributeError:
        rpcclt = None
    if rpcclt:
        return rpcclt.remotecall("exec", "get_the_calltip",
                                 (expression,), {})
    else:
        entity = self.get_entity(expression)
        return get_arg_text(entity)