'Print help string for this object or an attribute of this object.
:param (str) attribute: A valid attribute string for this object.
:param (bool) return_help: Return help_string instead of printing it?
:return: (None|str)'

def help(self, attribute=None, return_help=False):

    if (not attribute):
        return super(PlotlyDict, self).help(return_help=return_help)
    object_name = self._name
    path = self._get_path()
    parent_object_names = self._get_parent_object_names()
    help_string = graph_objs_tools.get_help(object_name, path, parent_object_names, attribute)
    if return_help:
        return help_string
    print help_string
