class MyGen():

    current = 0
    def __init__(self, first, last):
        self.first = first
        self.last = last

    def __iter__(self):
        return self
    

    def __next__(self):
        if MyGen.current < self.last:
            num = MyGen.current
            MyGen.current += 1
            return num
        raise StopIteration
    
gen = MyGen(0,100)

for i in gen:
    print(i)