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Python

Posted by Muhammad Ibrahim
Muhammad Ibrahim
1,361 Points

Reg the morse code challenge task 1 of 1. I am entering this code which should give the correct output but i get error

The code below is my code which I think should give the correct answer but somehow your system says that the output is not what is expected. When i run this code on my python installation it gives the correct and desired output. Can someone explain what is wrong?

class Letter: def init(self, pattern=None): self.pattern = pattern self.newstr='' self.l=len(pattern)

def __str__(self):
    k=1
    for i in self.pattern:
        self.newstr+='dot' if i=='.' else 'dash' 
        if k!=self.l:
            self.newstr+='-'
        k+=1
    return self.newstr

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

morse.py 
class Letter:
    def __init__(self, pattern=None):
        self.pattern = pattern
        self.newstr=''
        self.l=len(pattern)


    def __str__(self):
        k=1
        for i in self.pattern:
            self.newstr+='dot' if i=='.' else 'dash' 
            if k!=self.l:
                self.newstr+='-'
            k+=1
        return self.newstr 

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

1 Answer

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

Since "self.newstr" is not cleared at the beginning of the "__str__" method, it may still contain the results of a previous method call and add on to it.

Optionally, "newstr" could be a local variable of the method and not an instance variable. The same could be done with "self.l".

Muhammad Ibrahim
Muhammad Ibrahim
1,361 Points

Got it! Thanks. It works now.