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

Posted by Bob Prestridge
Bob Prestridge
8,400 Points

Attaching code this time: object-oriented Python

This is the challenge:

Let's practice using @classmethod!

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

Following is my code; I don't understand what I'm doing wrong.

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):
        new_list = string.split('-')
        dot_dash = []
        for blip in new_list:
            if blip == 'dash':
                dot_dash.append('_')
            else:
                dot_dash.append('.')
        return cls(dot_dash)    

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

2 Answers

Steven Parker
Steven Parker
231,007 Points
Steven Parker
Steven Parker
231,007 Points

The code looks great. :+1: You just need to indent the "@classmethod" line.

Bob Prestridge
Bob Prestridge
8,400 Points
Bob Prestridge
Bob Prestridge
8,400 Points

It worked! Thank you, Mr. Parker!