class Animal(object):
    'an abstraction of animal'

    numDogs = 0

    def __init__(self, s = 'dog', l = 'woof'):
        'the constructor'
        self.species = s
        self.lang = l
        if self.species.lower() == 'dog':
            Animal.numDogs += 1

    def setSpecies(self, s):
        'set the species of the animal'
        if self.species.lower() == 'dog':
            Animal.numDogs -= 1
        self.species = s
        if self.species.lower() == 'dog':
            Animal.numDogs += 1


    def setLanguage(self, l):
        'set the language of the animal'
        self.lang = l

    def speak(self):
        'make the animal speak'
        return 'I am a {} and I {}.'.format(self.species, self.lang)

    def __repr__(self):
        'the representation'
        return 'species = {}, language = {}'.format(self.species, self.lang)

    def __str__(self):
        'the string representation'
        return self.speak()