human
Solve the following python programming problem given the following code:
def _wrap_protocols(self, step_num, step_type) : 
    "Pick the protocol classes to use for reading and writing
        for the given step, and wrap them so that bad input and output
        trigger a counter rather than an exception unless --strict-protocols
        is set.

        Returns a tuple of ``(read_lines, write_line)``

        ``read_lines()`` is a function that reads lines from input, decodes
            them, and yields key, value pairs.
        ``write_line()`` is a function that takes key and value as args,
            encodes them, and writes a line to output.

        :param step_num: which step to run (e.g. 0)
        :param step_type: ``'mapper'``, ``'reducer'``, or ``'combiner'`` from
                          :py:mod:`mrjob.step`
        " 
    (read, write) = self.pick_protocols (read, step_type) 
    def read_lines() : 
        for line in self._read_input () : 
            try : 
                (key, value) = read (line.rstrip (b'\r
')) 
                (yield (key, value)) 
except Exception as e : 
                if (self.options.strict_protocols is not False) : 
                    raise 
else : 
                    self.increment_counter ('Undecodable input', e.__class__.__name__) 
def write_line(key, value) : 
        try : 
            self.stdout.write (write (key, value)) 
            self.stdout.write (b'
') 
except Exception as e : 
            if (self.options.strict_protocols is not False) : 
                raise 
else : 
                self.increment_counter ('Unencodable output', e.__class__.__name__) 
return (read_lines, write_line) 

    
    

    Fix the buggy line: (read, write) = self.pick_protocols (read, step_type)
assistant
#Here is Python code to fix the buggy line: (read, write) = self.

(read, write) = self.pick_protocols (step_num, step_type)