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Python

Posted by Clifford Gagliardo
Clifford Gagliardo
Courses Plus Student 15,069 Points

I don't understand this problem or classmethods I'm afraid, even after watching the video several times.

What is going on here? I feel like I still don't get classmethods, and that's after watching the video several times and reading the transcript. I feel like there should be a teachers notes with definitions written clearly and not just asides. I'm feeling quite lost here.

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):
        correct = []
        if string == "dash-dot": 
            correct.append("_", ".")
        return cls(correct)


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

1 Answer

juliansteffen
juliansteffen
9,802 Points
juliansteffen
juliansteffen
9,802 Points

Dear Clifford,

don't give up:) You did pretty good. But you missed a important word "like"

Create a class method in Letter named from_string that takes a string like "dash-dot" and creates an instance with the correct pattern (['_', '.']).

It just an example what could be the pattern. You check very static for this pattern in your code. if string == "dash-dot": correct.append("_", ".")

You need to do this a bit more dynamic/flexible that it could be every pattern. even "dot-dot-dot-dot"

I hope this little hint is helping you.

Greating Julian

Clifford Gagliardo
Clifford Gagliardo
Courses Plus Student 15,069 Points

Thank you! I think I forgot to consider all the steps needed to make a string more flexible.