def _preload_range(self):
        queue = self._read_queue
        size = self._buffer_size
        start = self._seek
        end = int(start + size * self._max_buffers)
        workers_submit = self._workers.submit
        indexes = tuple(range(start, end, size))
        for seek in tuple(queue):
            if seek not in indexes:
                del queue[seek]
        read_range = self._read_range
        for seek in indexes:
            if seek not in queue:
                queue[seek] = workers_submit(read_range, seek, seek + size)
_preload_range(self=<tests.test_io_buffered.DummyBufferedIO name='name' mode='r'>, self._buffer_size=100, self._cache={}, self._client_kwargs={}, self._max_buffers=100, self._mode='r', self._name='name', self._raw=<tests.test_io_buffered.DummyRawIO name='name' mode='r'>, self._read_queue={}, self._read_range=<bound method test_object_buffered_base_io.<locals>.DummyRawIO._read_range of <tests.test_io_buffered.DummyRawIO name='name' mode='r'>>, self._readable=True, self._seek=0, self._seek_lock=<locked _thread.lock object at 0x7ffa2342a540>, self._seekable=True, self._size=10000, self._workers_count=None, self._workers_pool=None, self._writable=False)

<bound method test_object_buffered_base_io.<locals>.DummyRawIO._read_range of <tests.test_io_buffered.DummyRawIO name='name' mode='r'>>

<locked _thread.lock object at 0x7ffa2342a540>

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=pending>, 400: <Future at 0x7ffa22b08970 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=pending>, 700: <Future at 0x7ffa22b08d60 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=pending>, 700: <Future at 0x7ffa22b08d60 state=pending>, 800: <Future at 0x7ffa22b08e50 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=pending>, 1100: <Future at 0x7ffa22b08f10 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=pending>, 1100: <Future at 0x7ffa22b08f10 state=pending>, 1200: <Future at 0x7ffa22907310 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=pending>, 1100: <Future at 0x7ffa22b08f10 state=pending>, 1200: <Future at 0x7ffa22907310 state=pending>, 1300: <Future at 0x7ffa22907400 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=finished returned bytes>, 1100: <Future at 0x7ffa22b08f10 state=finished returned bytes>, 1200: <Future at 0x7ffa22907310 state=finished returned bytes>, 1300: <Future at 0x7ffa22907400 state=finished returned bytes>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=finished returned bytes>, 1100: <Future at 0x7ffa22b08f10 state=finished returned bytes>, 1200: <Future at 0x7ffa22907310 state=finished returned bytes>, 1300: <Future at 0x7ffa22907400 state=finished returned bytes>, 1400: <Future at 0x7ffa22b08940 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=finished returned bytes>, 1100: <Future at 0x7ffa22b08f10 state=finished returned bytes>, 1200: <Future at 0x7ffa22907310 state=finished returned bytes>, 1300: <Future at 0x7ffa22907400 state=finished returned bytes>, 1400: <Future at 0x7ffa22b08940 state=pending>, 1500: <Future at 0x7ffa22907370 state=pending>}

{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=finished returned bytes>, 1100: <Future at 0x7ffa22b08f10 state=finished returned bytes>, 1200: <Future at 0x7ffa22907310 state=finished returned bytes>, 1300: <Future at 0x7ffa22907400 state=finished returned bytes>, 1400: <Future at 0x7ffa22b08940 state=pending>, 1500: <Future at 0x7ffa22907370 state=pending>, 1600: <Future at 0x7ffa22907160 state=pending>}

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{0: <Future at 0x7ffa2342ae50 state=finished returned bytes>, 100: <Future at 0x7ffa22b08370 state=finished returned bytes>, 200: <Future at 0x7ffa22b08610 state=finished returned bytes>, 300: <Future at 0x7ffa22b08340 state=finished returned bytes>, 400: <Future at 0x7ffa22b08970 state=finished returned bytes>, 500: <Future at 0x7ffa22b08a60 state=finished returned bytes>, 600: <Future at 0x7ffa22b08790 state=finished returned bytes>, 700: <Future at 0x7ffa22b08d60 state=finished returned bytes>, 800: <Future at 0x7ffa22b08e50 state=finished returned bytes>, 900: <Future at 0x7ffa22b08f40 state=finished returned bytes>, 1000: <Future at 0x7ffa22b08cd0 state=finished returned bytes>, 1100: <Future at 0x7ffa22b08f10 state=finished returned bytes>, 1200: <Future at 0x7ffa22907310 state=finished returned bytes>, 1300: <Future at 0x7ffa22907400 state=finished returned bytes>, 1400: <Future at 0x7ffa22b08940 state=finished returned bytes>, 1500: <Future at 0x7ffa22907370 state=finished returned bytes>, 1600: <Future at 0x7ffa22907160 state=finished returned bytes>, 1700: <Future at 0x7ffa229076a0 state=finished returned bytes>, 1800: <Future at 0x7ffa22907730 state=finished returned bytes>, 1900: <Future at 0x7ffa22907550 state=pending>}

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at 0x7ffa20059340 state=pending>}

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<bound method ThreadPoolExecutor.submit of <concurrent.futures.thread.ThreadPoolExecutor object at 0x7ffa243b4e50>>

<bound method test_object_buffered_base_io.<locals>.DummyRawIO._read_range of <tests.test_io_buffered.DummyRawIO name='name' mode='r'>>