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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 _worker_handler(future, worker, pipe, timeout):
 """Worker lifecycle manager. Waits for the worker to be perform its task, collects result, runs the callback and cleans up the process. """

    result = _get_result(future, pipe, timeout)

    if isinstance(result, BaseException):
        if isinstance(result, ProcessExpired):
            result.exitcode = worker.exitcode

        future.set_exception(result)
    else:
        future.set_result(result)

    if worker.is_alive():
        stop_process(worker)