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Python

Andrei Oprescu
Andrei Oprescu
9,547 Points
Posted by Andrei Oprescu
Andrei Oprescu
9,547 Points

I don't get this

Hi!

I am currently on this question that confuses me. My code currently is:

class Letter: pattern1 = [] def init(self, pattern=None): self.pattern = str()

def __str__(self):
    pattern = pattern.split(', ')
    for sign in pattern:
        if sign == '.':
            pattern1 + 'dot'
        elif sign == '-':
            pattern1 + 'dash'
    pattern1 = '-'.join(pattern1)
    return pattern1

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

And the question is:

Let's use str to turn Python code into Morse code! OK, not really, but we can turn class instances into a representation of their Morse code counterparts.

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".

I can probably understand that I am doing something wrong as I am not getting thin one correct.

Could you please help me?

Thanks!

morse.py 
class Letter:
    pattern1 = []
    def __init__(self, pattern=None):
        self.pattern = __str__()

    def __str__(self):
        pattern = pattern.split(', ')
        for sign in pattern:
            if sign == '.':
                pattern1 + 'dot'
            elif sign == '-':
                pattern1 + 'dash'
        pattern1 = '-'.join(pattern1)
        return pattern1

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

3 Answers

Dan Garrison
Dan Garrison
22,457 Points
Dan Garrison
Dan Garrison
22,457 Points

You are close, but there are a few issues.

  1. You don't need the empty list at the beginning of the class.
  2. In the init, you should set self.pattern = pattern.
  3. At the beginning of your str method, you should initialize an empty list.
  4. Call it something like str_pattern and set the value to an empty list [].
  5. In your for loop, you need to look for sign in "self.pattern". The self.pattern is referencing the pattern attribute for the current instance of your Letter object.
  6. In your if/else statement, you should append either "dot" or "dash" to your empty list.
  7. At the end, you should return your str_pattern list
Andrei Oprescu
Andrei Oprescu
9,547 Points
Andrei Oprescu
Andrei Oprescu
9,547 Points

I understand, but I still get an error to this:

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

def __str__(self):
    str_pattern = []
    for sign in self.pattern:
        if sign == '.':
            str_pattern.append('dot')
        elif sign == '_':
            str_pattern.append('dash')
    '-'.join(str_pattern)
    return str_pattern

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

Dan Garrison
Dan Garrison
22,457 Points
Dan Garrison
Dan Garrison
22,457 Points

You would need to return the '-'.join(str_pattern)

Sorry should have been more clear on that.

Andrei Oprescu
Andrei Oprescu
9,547 Points
Andrei Oprescu
Andrei Oprescu
9,547 Points

Thanks a lot! it actually worked!