Print the previous and current line with line numbers and
        a carret under the current character position.

        Will also print a message if one is given to this exception.

def pretty_print(self, carrot=True):
        """Print the previous and current line with line numbers and
        a carret under the current character position.

        Will also print a message if one is given to this exception.
        """
        output = ['\n']
        output.extend([line.pretty_print() for line in
                       self.partpyobj.get_surrounding_lines(1, 0)])

        if carrot:
            output.append('\n' +
                          (' ' * (self.partpyobj.col + 5)) + '^' + '\n')
        if self.partpymsg:
            output.append(self.partpymsg)

        return ''.join(output)