          retval = all(not thread.is_alive() for thread in self._threads)
          logger.debug(retval)
          return retval
  
      def join(self):
          """ Join the running threads, catching and re-raising any errors """
          logger.debug("Joining Threads: '%s'", self._name)
          for thread in self._threads:
              logger.debug("Joining Thread: '%s'", thread._name)  # pylint: disable=protected-access
              thread.join()
 
</s> remove     def completed(self):
        """ Return False if there are any alive threads else True """
 </s> add     def completed(self) -> bool:
        """ Check if all threads have completed

        Returns
        -------
        ``True`` if all threads have completed otherwise ``False``
        """ </s> remove     def start(self):
        """ Start a thread with the given method and args """
 </s> add     def start(self) -> None:
        """ Start all the threads for the given method, args and kwargs """ </s> remove     def is_alive(self):
        """ Return true if any thread is alive else false """
 </s> add     def is_alive(self) -> bool:
        """ Check if any threads are still alive

        Returns
        -------
        bool
            ``True`` if any threads are alive. ``False`` if no threads are alive
        """ </s> remove     def has_error(self):
        """ Return true if a thread has errored, otherwise false """
 </s> add     def has_error(self) -> bool:
        """ bool: ``True`` if a thread has errored, otherwise ``False`` """ </s> remove             name = "{}_{}".format(self._name, idx)
 </s> add             name = self._name if self._thread_count == 1 else f"{self._name}_{idx}"
    def join(self) -> None:
          retval = all(not thread.is_alive() for thread in self._threads)
          logger.debug(retval)
          return retval
  
    def join(self) -> None:
          """ Join the running threads, catching and re-raising any errors """
          logger.debug("Joining Threads: '%s'", self._name)
          for thread in self._threads:
              logger.debug("Joining Thread: '%s'", thread._name)  # pylint: disable=protected-access
              thread.join()
keep keep keep keep replace keep keep keep keep keep
 bugfix - timelapse image loader
multithreading.py - typing + docs 
lib/multithreading.py