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Python

Posted by Emily Strobl
Emily Strobl
5,429 Points

don't understand what the task is asking

I'm confused on what I'm suppose to do

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


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

2 Answers

Maxwell Newberry
Maxwell Newberry
7,693 Points
Maxwell Newberry
Maxwell Newberry
7,693 Points

They want you to create a method within the Letter class. Which you can add right underneath the first __init__ method. 

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

    def __str__(self):

Then we want to initialize a string to return that will eventually contain our pattern in text form.

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

    def __str__(self):
        return_string = ""

Once we have that, we need to create for-loop that will iterate through the entire pattern, item by item, so that we can check whether it is a . or _ and change the content to text form of dot or dash.

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

    def __str__(self):
        return_string = ""

        for index, item in enumerate(self.pattern):
            # iterate through each item in pattern

The next part is to check whether the current item is a dot or dash and then add that item to the return string. 

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

    def __str__(self):
        return_string = ""

        for index, item in enumerate(self.pattern):
            # iterate through each item in pattern
            if item == '.':
                # dot
                return_string += "dot"
            else:
                # dash
                return_string += "dash"

Then, the final step is to separate each item by a hyphen. But, we don't want to add a hyphen to the last item so we need to check whether the item we're on is the last item or not using an if-statement. The following code does this after we add the text, note the indentation of this if-statement, it is within the for-loop, but outside of the if-statement. This is because we want to do this at the end of loop iteration each item.

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

    def __str__(self):
        return_string = ""

        for index, item in enumerate(self.pattern):
            # iterate through each item in pattern
            if item == '.':
                # dot
                return_string += "dot"
            else:
                # dash
                return_string += "dash"

            if index != len(self.pattern)-1:
                # separate with hyphen if not final index
                return_string += "-"

            return return_string

Return your final string and you're done!

nikel Hayo
nikel Hayo
1,943 Points
nikel Hayo
nikel Hayo
1,943 Points

hi, indentation at the last line(return return_string) should be at the same line with "for" above.