Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python

Keenan Smith
seal-mask
.a{fill-rule:evenodd;}techdegree
Keenan Smith
Python Development Techdegree Student 5,487 Points
Posted by Keenan Smith
.a{fill-rule:evenodd;}techdegree
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
231,248 Points
Steven Parker
Steven Parker
231,248 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
231,248 Points
Steven Parker
Steven Parker
231,248 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