#!/usr/bin/env python
# -*- coding: utf-8 -*-

from collections import namedtuple

ChemEl = namedtuple('Element', 'name atomic_number symbol group period atomic_weight')
# same as defining a class for elements 

hydrogen = ChemEl('hydrogen', 1, 'H', 1, 1, 1.008)
helium = ChemEl('helium', 2, 'He', 18, 1, 4.002602)

print(hydrogen.atomic_weight)
print(hydrogen.symbol)

print(hydrogen, type(hydrogen))
print(helium)