asyncio: Remove asyncio.timeout() context manager.

It will probably be added back in Python 3.6, once its compatibility
issues are resolved; see [1] for more details.

[1] https://mail.python.org/pipermail/async-sig/2016-June/000045.html

Lib/test/test_asyncio/test_tasks.py

@@ -2260,192 +2260,5 @@ class SleepTests(test_utils.TestCase):
         self.assertEqual(result, 11)
 
 
-class TimeoutTests(test_utils.TestCase):
-    def setUp(self):
-        self.loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(None)
-
-    def tearDown(self):
-        self.loop.close()
-        self.loop = None
-
-    def test_timeout(self):
-        canceled_raised = [False]
-
-        @asyncio.coroutine
-        def long_running_task():
-            try:
-                yield from asyncio.sleep(10, loop=self.loop)
-            except asyncio.CancelledError:
-                canceled_raised[0] = True
-                raise
-
-        @asyncio.coroutine
-        def go():
-            with self.assertRaises(asyncio.TimeoutError):
-                with asyncio.timeout(0.01, loop=self.loop) as t:
-                    yield from long_running_task()
-                    self.assertIs(t._loop, self.loop)
-
-        self.loop.run_until_complete(go())
-        self.assertTrue(canceled_raised[0], 'CancelledError was not raised')
-
-    def test_timeout_finish_in_time(self):
-        @asyncio.coroutine
-        def long_running_task():
-            yield from asyncio.sleep(0.01, loop=self.loop)
-            return 'done'
-
-        @asyncio.coroutine
-        def go():
-            with asyncio.timeout(0.1, loop=self.loop):
-                resp = yield from long_running_task()
-            self.assertEqual(resp, 'done')
-
-        self.loop.run_until_complete(go())
-
-    def test_timeout_gloabal_loop(self):
-        asyncio.set_event_loop(self.loop)
-
-        @asyncio.coroutine
-        def run():
-            with asyncio.timeout(0.1) as t:
-                yield from asyncio.sleep(0.01)
-                self.assertIs(t._loop, self.loop)
-
-        self.loop.run_until_complete(run())
-
-    def test_timeout_not_relevant_exception(self):
-        @asyncio.coroutine
-        def go():
-            yield from asyncio.sleep(0, loop=self.loop)
-            with self.assertRaises(KeyError):
-                with asyncio.timeout(0.1, loop=self.loop):
-                    raise KeyError
-
-        self.loop.run_until_complete(go())
-
-    def test_timeout_canceled_error_is_converted_to_timeout(self):
-        @asyncio.coroutine
-        def go():
-            yield from asyncio.sleep(0, loop=self.loop)
-            with self.assertRaises(asyncio.CancelledError):
-                with asyncio.timeout(0.001, loop=self.loop):
-                    raise asyncio.CancelledError
-
-        self.loop.run_until_complete(go())
-
-    def test_timeout_blocking_loop(self):
-        @asyncio.coroutine
-        def long_running_task():
-            time.sleep(0.05)
-            return 'done'
-
-        @asyncio.coroutine
-        def go():
-            with asyncio.timeout(0.01, loop=self.loop):
-                result = yield from long_running_task()
-            self.assertEqual(result, 'done')
-
-        self.loop.run_until_complete(go())
-
-    def test_for_race_conditions(self):
-        fut = asyncio.Future(loop=self.loop)
-        self.loop.call_later(0.1, fut.set_result('done'))
-
-        @asyncio.coroutine
-        def go():
-            with asyncio.timeout(0.2, loop=self.loop):
-                resp = yield from fut
-            self.assertEqual(resp, 'done')
-
-        self.loop.run_until_complete(go())
-
-    def test_timeout_time(self):
-        @asyncio.coroutine
-        def go():
-            foo_running = None
-
-            start = self.loop.time()
-            with self.assertRaises(asyncio.TimeoutError):
-                with asyncio.timeout(0.1, loop=self.loop):
-                    foo_running = True
-                    try:
-                        yield from asyncio.sleep(0.2, loop=self.loop)
-                    finally:
-                        foo_running = False
-
-            dt = self.loop.time() - start
-            # tolerate a small delta for slow delta or unstable clocks
-            self.assertTrue(0.09 < dt < 0.12, dt)
-            self.assertFalse(foo_running)
-
-        self.loop.run_until_complete(go())
-
-    def test_timeout_disable(self):
-        @asyncio.coroutine
-        def long_running_task():
-            yield from asyncio.sleep(0.1, loop=self.loop)
-            return 'done'
-
-        @asyncio.coroutine
-        def go():
-            t0 = self.loop.time()
-            with asyncio.timeout(None, loop=self.loop):
-                resp = yield from long_running_task()
-            self.assertEqual(resp, 'done')
-            dt = self.loop.time() - t0
-            # tolerate a time delta for clocks with bad resolution
-            # and slow buildbots
-            self.assertTrue(0.09 < dt < 0.15, dt)
-        self.loop.run_until_complete(go())
-
-    def test_raise_runtimeerror_if_no_task(self):
-        with self.assertRaises(RuntimeError):
-            with asyncio.timeout(0.1, loop=self.loop):
-                pass
-
-    def test_outer_coro_is_not_cancelled(self):
-
-        has_timeout = [False]
-
-        @asyncio.coroutine
-        def outer():
-            try:
-                with asyncio.timeout(0.001, loop=self.loop):
-                    yield from asyncio.sleep(1, loop=self.loop)
-            except asyncio.TimeoutError:
-                has_timeout[0] = True
-
-        @asyncio.coroutine
-        def go():
-            task = asyncio.ensure_future(outer(), loop=self.loop)
-            yield from task
-            self.assertTrue(has_timeout[0])
-            self.assertFalse(task.cancelled())
-            self.assertTrue(task.done())
-
-        self.loop.run_until_complete(go())
-
-    def test_cancel_outer_coro(self):
-        fut = asyncio.Future(loop=self.loop)
-
-        @asyncio.coroutine
-        def outer():
-            fut.set_result(None)
-            yield from asyncio.sleep(1, loop=self.loop)
-
-        @asyncio.coroutine
-        def go():
-            task = asyncio.ensure_future(outer(), loop=self.loop)
-            yield from fut
-            task.cancel()
-            with self.assertRaises(asyncio.CancelledError):
-                yield from task
-            self.assertTrue(task.cancelled())
-            self.assertTrue(task.done())
-
-        self.loop.run_until_complete(go())
-
 if __name__ == '__main__':
     unittest.main()