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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _text(code, quiet_zone=4):
 """This method returns a text based representation of the QR code. This is useful for debugging purposes. """

    buf = io.StringIO()

    border_row = '0' * (len(code[0]) + (quiet_zone*2))

    #Every QR code start with a quiet zone at the top
    for b in range(quiet_zone):
        buf.write(border_row)
        buf.write('\n')

    for row in code:
        #Draw the starting quiet zone
        for b in range(quiet_zone):
            buf.write('0')

        #Actually draw the QR code
        for bit in row:
            if bit == 1:
                buf.write('1')
            elif bit == 0:
                buf.write('0')
            #This is for debugging unfinished QR codes,
            #unset pixels will be spaces.
            else:
                buf.write(' ')
        
        #Draw the ending quiet zone
        for b in range(quiet_zone):
            buf.write('0')
        buf.write('\n')

    #Every QR code ends with a quiet zone at the bottom
    for b in range(quiet_zone):
        buf.write(border_row)
        buf.write('\n')

    return buf.getvalue()