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Python

Posted by vincent juma
vincent juma
1,159 Points

Hi everyone, kindly help me figure out my error.

I want you to add a str method to the Letter class that loops through the pattern attribute of an instance and returns "dot" for every "." (period) and "dash" for every "_" (underscore). Join them with a hyphen.

I've included an S class as an example (I'll generate the others when I test your code) and it's str output should be "dot-dot-dot".

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

    def __str__(self):
        new_pattern = ""

        for item in self.pattern:
            if item == "." :
                new_pattern = new_pattern + "dot"

            elif item == "_" :
                new_pattern = new_pattern + "dash"

        return new_pattern

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

2 Answers

Josh Stephens
Josh Stephens
13,529 Points

I would change new_pattern to be a list and then append each item to the list and then return the list using a join. ''.join(new_pattern)

In [1]: pattern = ['.', '-', '.']

In [2]: ''.join(pattern)
Out[2]: '.-.'

However, I am not sure I understood what error you were experiencing so please take this comment / answer with a grain of salt

vincent juma
vincent juma
1,159 Points
vincent juma
vincent juma
1,159 Points

thanks Josh, I followed your approach and it worked