How to return a string by concatenating characters in python

Question

I have written the following code in Python 2.7

class BinaryCode:
    def decode(self, message):
        result = str(0)
        result += str(message[0])
        for i in range(1, len(message)-1):
            result += str(int(message[i])-int(result[i])-int(result[i-1]))
        return result

When I initialise message as 123210122, I want the result to be 011100011 but instead it's {"0", "1", "1", "1", "0", "0", "0", "1", "1"}. How to do this?

This is a topcoder SRM 144 Div 2 problem and this was the result.

enter image description here

Now, when I run this code in IDLE it gives me a string but then why its not working in topcoder?

I just ran that, it returns 011100011 (so either this is not the code you run, or this is not the input you obtain) — njzk2
– njzk2, Commented Jun 16, 2015 at 17:55
@sunny: why would that work? do you not think result is already supposed to be a string? — njzk2
– njzk2, Commented Jun 16, 2015 at 17:56
ok i figured it out. he wants the result to be the number in binary, not a string. not very obvious but after running his code that's the only interpretation i can have. — bbill
– bbill, Commented Jun 16, 2015 at 17:58
If I make sure message is a string, then this works fine... — River
– River, Commented Jun 16, 2015 at 18:01

hspandher · Accepted Answer · 2015-06-16 19:17:29Z

0

Just change last line of function to return ''.join(result).

answered Jun 16, 2015 at 19:17

hspandher

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