<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def start(self, verbose=None, end_in_new_line=None):
 """Start the stopwatch if it is paused. If the stopwatch is already started, then nothing will happen. Parameters verbose : Optional[bool] Wether to log. If `None`, use `verbose_start` set during initialization. end_in_new_line : Optional[bool]] If `False`, prevent logging the trailing new line. If `None`, use `end_in_new_line` set during initialization. """

        if self._start_time is not None and self._end_time is None:
            # the stopwatch is already running
            return self
        if verbose is None:
            verbose = self.verbose_start
        if verbose:
            if end_in_new_line is None:
                end_in_new_line = self.end_in_new_line
            if end_in_new_line:
                self.log(self.description)
            else:
                self.log(self.description, end="", flush=True)
        self._end_time = None
        self._start_time = datetime.datetime.now()
        return self