No method name

class Letter:
    def __init__(self, pattern=None):
        self.pattern = pattern

    def __iter__(self):
        yield from self.pattern

    def __str__(self):
        output = []
        for blip in self:
            if blip == '.':
                output.append('dot')
            else:
                output.append('dash')
        return '-'.join(output)

        @classmethod
        def from_string(cls, string):
            string_list = string.split('-')
            pattern_list = []
            for i in string_list:
                if i == 'dash':
                    pattern_list.append('_')
                elif i == 'dot':
                    pattern_list.append('.')       
                else:
                    pass

        return cls(pattern_list)



class S(Letter):
    def __init__(self):
         pattern = ['.', '.', '.']
         super().__init__(pattern)