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Python

So I tried to create the class method as illustrated in the video , but still having issues

So I tried to create the class method as illustrated in the video , but still having issues

morse.py
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')
   #@classmethod
    #def from_string(cls,""):
        #return '-'.join(output)

     @classmethod from_string(cls,""):
        return '-'.join(output)








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