def METHOD_NAME(objtype, symbol):
    """Get the docstring for object-type and symbol.
    Ex:
    get_docstring('Vector','sqrt')
    returns a string
    """
    global _help_dict
    if _help_dict is None:
        import neuron
        import os
        import zlib
        import pickle
        f = open(os.path.join(os.path.split(neuron.__file__)[0], "help_data.dat"), "rb")
        _help_dict = pickle.loads(zlib.decompress(f.read()))
        f.close()
    if (objtype, symbol) == ("", ""):
        return doc_h
    # are we asking for help on a class, e.g. h.Vector
    if objtype == "":
        if symbol in _help_dict:
            return _get_class_from_help_dict(symbol)
        else:
            return default_class_doc_template % symbol
    # are we asking for help on a object, e.g. h.Vector()
    if symbol == "":
        if objtype in _help_dict:
            return _get_class_from_help_dict(objtype)
        else:
            return default_object_doc_template % symbol
    # are we asking for help on a member of an object, e.g. h.Vector.size
    full_name = f"{objtype}.{symbol}"
    if full_name in _help_dict:
        return _get_from_help_dict(full_name)
    else:
        return default_member_doc_template % (
            objtype,
            symbol,
            METHOD_NAME(objtype, ""),
        )