  import queue as Queue
  import sys
  import threading
  
  logger = logging.getLogger(__name__)  # pylint: disable=invalid-name
  _ErrorType = Optional[Union[Tuple[Type[BaseException], BaseException, TracebackType],
                              Tuple[Any, Any, Any]]]
 
</s> remove     def run(self):
 </s> add     def run(self) -> None:
        """ Runs the target, reraising any errors from within the thread in the caller. """ </s> remove         self._gen_kwargs = kwargs or dict()
 </s> add         self._gen_kwargs = kwargs or {} </s> remove     """ Run a queue in the background. From:
        https://stackoverflow.com/questions/7323664/ """
    # See below why prefetch count is flawed
    def __init__(self, generator, prefetch=1, thread_count=2,
                 queue=None, args=None, kwargs=None):
        # pylint:disable=too-many-arguments
        super().__init__(target=self._run, thread_count=thread_count)
        self.queue = queue or Queue.Queue(prefetch)
 </s> add     """ Run a task in the background background and queue data for consumption

    Parameters
    ----------
    generator: iterable
        The generator to run in the background
    prefetch, int, optional
        The number of items to pre-fetch from the generator before blocking (see Notes). Default: 1
    name: str, optional
        The thread name. if ``None`` a unique name is constructed of the form
        {generator.__name__}_N where N is an incrementing integer. Default: ``None``
   args: tuple, Optional
        The argument tuple for generator invocation. Default: ``None``.
    kwargs: dict, Optional
        keyword arguments for the generator invocation. Default: ``None``.

    Notes
    -----
    Putting to the internal queue only blocks if put is called while queue has already
    reached max size. Therefore this means prefetch is actually 1 more than the parameter
    supplied (N in the queue, one waiting for insertion)

    References
    ----------
    https://stackoverflow.com/questions/7323664/
    """
    def __init__(self,
                 generator: Callable,
                 prefetch: int = 1,
                 name: Optional[str] = None,
                 args: Optional[Tuple] = None,
                 kwargs: Optional[Dict[str, Any]] = None) -> None:
        super().__init__(name=name, target=self._run)
        self.queue: Queue.Queue = Queue.Queue(prefetch) </s> remove     """ Subclass of thread that passes errors back to parent """
    def __init__(self, group=None, target=None, name=None,  # pylint: disable=too-many-arguments
                 args=(), kwargs=None, *, daemon=None):
        super().__init__(group=group, target=target, name=name,
                         args=args, kwargs=kwargs, daemon=daemon)
        self.err = None

    def check_and_raise_error(self):
        """ Checks for errors in thread and raises them in caller """
 </s> add     """ Subclass of thread that passes errors back to parent

    Parameters
    ----------
    target: callable object, Optional
        The callable object to be invoked by the run() method. If ``None`` nothing is called.
        Default: ``None``
    name: str, optional
        The thread name. if ``None`` a unique name is constructed of the form "Thread-N" where N
        is a small decimal number. Default: ``None``
    args: tuple
        The argument tuple for the target invocation. Default: ().
    kwargs: dict
        keyword arguments for the target invocation. Default: {}.
    """
    _target: Callable
    _args: Tuple
    _kwargs: Dict[str, Any]
    _name: str

    def __init__(self,
                 target: Optional[Callable] = None,
                 name: Optional[str] = None,
                 args: Tuple = (),
                 kwargs: Dict[str, Any] = None,
                 *,
                 daemon: Optional[bool] = None) -> None:
        super().__init__(target=target, name=name, args=args, kwargs=kwargs, daemon=daemon)
        self.err: _ErrorType = None

    def check_and_raise_error(self) -> None:
        """ Checks for errors in thread and raises them in caller.

        Raises
        ------
        Error
            Re-raised error from within the thread
        """
from types import TracebackType
from typing import Any, Callable, Dict, Generator, List, Tuple, Type, Optional, Set, Union
  import queue as Queue
  import sys
  import threading
from types import TracebackType
from typing import Any, Callable, Dict, Generator, List, Tuple, Type, Optional, Set, Union
  
  logger = logging.getLogger(__name__)  # pylint: disable=invalid-name
  _ErrorType = Optional[Union[Tuple[Type[BaseException], BaseException, TracebackType],
                              Tuple[Any, Any, Any]]]
keep keep add keep keep keep keep
 bugfix - timelapse image loader
multithreading.py - typing + docs 
lib/multithreading.py