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)
#print(next(g))
for i in gen:
    print(i)
