@classmethod

Question

confusing why it prints the same string but not convert to morse as it must. Could you please help me to understand?

test = Letter.from_string('dash-dot') print(test)

dash-dot instead of ['_', '.']

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')
        return '-'.join(output)

    @classmethod
    def from_string(cls, string):
        output2 = []
        x = string.split ('-')
        for i in x:
            if i == 'dash':
                output2.append ('_')
            elif i == 'dot':
                output2.append ('.')
        return cls(output2)


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

Answer 1 · 2017-09-05T16:26:44Z

September 5, 2017 4:26pm

When you do Letter.from_string(), it turns the pattern you send in, like "dash-dot", into a Morse code pattern, like _ . (of course we're storing it as a list, so ['_', '.']). When you print() a Letter, though, the __str__ method turns the list of dashes and dots into a string like "dash-dot". The from_string() and __str__() methods basically do the opposite of each other.

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Dmitriy Ignatiev

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@classmethod

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Kenneth Love

Kenneth Love