#Iteration test
a = (1, 2, 3)
b = iter(a)
print(next(b))
print(next(b))
print(next(b))

class A:
    def __init__(self):
        self.n = 0
    def __init__(self, n):
        self.n = n
    def __iter__(self):
        self.i = 0
        return self
    def __next__(self):
        if self.i > 100 or self.i < -100: raise StopIteration
        z = self.i
        self.i -= self.n
        return z
c = A(2)
d = iter(c)
for x in d:
    print(x)