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!

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


George Clement
George Clement
2,816 Points

not sure what I'm missing but this works in my IDE >>> from noclass import S >>> S().from_string("dash-dot")

not sure why but this works in my IDE but not on the site

>>> from noclass import S
>>> S().from_string("dash-dot")
['_', '.']

I must be missing something

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 == '.':
        return '-'.join(output)

    def from_string(cls, str):
        output = []
        for blip in str.split("-"):
            if blip == "dot":
            if blip == "dash":

        return output

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

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,388 Points

You are very close! The challenge asks that you return an instance of the class with the pattern extracted from the string. This can be done in your return statement:

return cls(output)

Also, it is not a good practice to used reserved words or built-in functions names as variable names. Best to use “string” instead of str.

Post back if you need more help. Good luck!!!