Tasl_4.2

import itertools


class Element:
    def __init__(self, name, symbol, number):
        self.name = name
        self.symbol = symbol
        self.number = number

    def dump(self):
        return f'{self.name}, {self.symbol}, {self.number}'

    def __str__(self):
        return f'{self.name.lower()}'


h = Element('Hydrogen', 'H', 1)
oxygen = Element('Oxygen', 'O', 16)
a = {'name': h.name, 'symbol': h.symbol, 'number': h.number}
hydrogen = Element("{name}".format(**a), '{symbol}'.format(**a), '{number}'.format(**a))
print(oxygen.dump())
print(oxygen)
print(hydrogen)