class A:
    def __init__(self):
        self.whatnot = 'thingy'
    def moreletters(anynameworks, moreness):
        anynameworks.whatnot += moreness
    def __str__(self):
        return 'A('+repr(self.whatnot)+')'

a = A()
print(a)
a.moreletters(' and so on')
print(a)