codewars/courses/python_oop/abstract/iter_3.py

class Iterator:

    def __init__(self, text: str):
        self.text = text.upper()
        self.index = 0

    def __iter__(self):
        return self
    
    def __next__(self):
        try:
            result = self.text[self.index]
        except IndexError:
            raise StopIteration
        self.index += 1
        return result
    
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~        

class SequenceIterator:

    def __init__(self, data):
        self.data = data
        self.start_index = 0

    def is_even(self, value):
        return value%2 == 0

    def __iter__(self):
        return self
    
    def __next__(self):

        if self.start_index >= len(self.data):
            raise StopIteration

        value = self.data[self.start_index]
        
        if self.is_even(len(self.data)) and self.start_index == len(self.data) - 2:
            self.start_index = 1
        elif self.is_even(len(self.data)) == False and self.start_index == len(self.data) - 1:
            self.start_index = 1
        else:
            self.start_index += 2

        return value


def test_2():
    container = SequenceIterator([1, 5, 4, 6, 43, True, 'hello'])
    # container = SequenceIterator([1, 5, 4, 6, 43, True])
    for i in container:
        print(i)

def test_1():
    phrase = Iterator('Qwerty')
    it_1 = iter(phrase)
    it_2 = iter(phrase)
    for i in it_1:
        print(i)

    for i in it_1:
        print(i)

    for i in it_2:
        print(i)

def main():
    # test_1()
    test_2()

if __name__ == '__main__':
    main()