list = [0,0,0,1,2,3,4,0,0,0,5,6,7,8,9,0,0,0]


class IteratorWithoutZeros:
    def __init__(self, my_list):
        self.list = my_list
        self.max = len(self.list)
        self.actual_position = 0

    def __next__(self):
        self.actual_position = self.actual_position + 1
        while self.list[self.actual_position] == 0:
            self.actual_position = self.actual_position + 1
            if self.actual_position == self.max:
                raise StopIteration
        return self.list[self.actual_position]

    def __iter__(self):
        return self


class FullIterator:
    def __init__(self, my_list):
        self.list = my_list
        self.max = len(self.list)
        self.actual_position = 0

    def __next__(self):
        self.actual_position = self.actual_position + 1
        if self.actual_position == self.max:
            raise StopIteration
        return self.list[self.actual_position]

    def __iter__(self):
        return self


iterator_without_zeros = IteratorWithoutZeros(list)
full_iterator = FullIterator(list)

without_zeros_list = []
full_list = []

for i in iterator_without_zeros:
    without_zeros_list.append(i)

for i in full_iterator:
    full_list.append(i)

print("Pełna lista: " + str(full_list))
print("Lista bez zer: " + str(without_zeros_list))