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Python

Keenan Smith
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Keenan Smith
Python Development Techdegree Student 5,487 Points
Posted by Keenan Smith
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Keenan Smith
Python Development Techdegree Student 5,487 Points

Class method

im pretty sure im doing this completely wrong at this point. Maybe im not reading the instructions right.

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, morse):
        new_list = []
        for i in morse:
            if i == "dash":
                new_list.append('_')
            elif i == "dot":
                new_list.append('.')
        return new_list


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

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

You're pretty close, but I see two issues:

If you iterate over the argument directly, the loop will extract each character individually. So you probably want to split the string into a list of words first.

Then instead of returning the new pattern itself, the instructions ask you to return a new class instance with the correct pattern in it.

Keenan Smith
seal-mask
.a{fill-rule:evenodd;}techdegree
Keenan Smith
Python Development Techdegree Student 5,487 Points
Keenan Smith
.a{fill-rule:evenodd;}techdegree
Keenan Smith
Python Development Techdegree Student 5,487 Points

So would the class instance I return be cls? Or would it be Letter()? I am confused about having a new class instance created.

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

You can create a new class instance like this:

new_class_instance = cls()                # an empty one
new_class_instance = cls(pattern_list)    # or with pattern in it