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Python

Posted by Christopher Carucci
Christopher Carucci
1,971 Points

Classmethod help.

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 (['_', '.']).

And that's that.

morse.py 
class Letter:
    def __init__(self, pattern=None):
        self.pattern = pattern

    @classmethod
        def from_string(cls, string):
            split = string.split("-")
            new_l = []
            for item in split:
                if item == "dot":
                    new_l.append(".")
                else:
                    new_l.append("_")
            return cls(new_l)

    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)


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

3 Answers

Alexander Davison
Alexander Davison
65,469 Points
Alexander Davison
Alexander Davison
65,469 Points

Fix your indentation, and you should pass!

Highlight this block of code:

def from_string(cls, string):
    split = string.split("-")
    new_l = []
    for item in split:
        if item == "dot":
            new_l.append(".")
        else:
            new_l.append("_")
    return cls(new_l)

And push ⌘[ on Mac and Ctrl+[ on Windows, and it should un-indent the snippet.

Christopher Carucci
Christopher Carucci
1,971 Points
Christopher Carucci
Christopher Carucci
1,971 Points

Does this work for you? I feel as though I fixed the indentation and I get rejected. :(

Alexander Davison
Alexander Davison
65,469 Points

It works for me. Paste your code, and I can help.

Christopher Carucci
Christopher Carucci
1,971 Points
Christopher Carucci
Christopher Carucci
1,971 Points

'''

class Letter: def init(self, pattern=None): self.pattern = pattern

@classmethod
def from_string(cls, string):
    split = string.split("-")
    new_l = []
    for item in split:
        if item == "dot":
            new_l.append(".")
        else:
            new_l.append("_")
    return cls(new_l)


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)

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

'''