old_contents: import asyncio
  import unittest
  
  
  class Test(unittest.TestCase):
      def setUp(self):
          self.loop = asyncio.new_event_loop()
          asyncio.set_event_loop(None)
  
      def tearDown(self):
          self.loop.close()
  
      def test_sleep(self):
          @asyncio.coroutine
          def go():
             t0 = self.loop.time()
             yield from asyncio.sleep(0.5, loop=self.loop)
             t1 = self.loop.time()
             self.assertTrue(0.4 <= t1-t0 <= 0.6, t1-t0)
  
          self.loop.run_until_complete(go())
  
      def test_pythonasynciodebug(self):
          @asyncio.coroutine
          def go():
              asyncio.sleep(0.5, loop=self.loop)  # missed `yield from`
  
          self.loop.run_until_complete(go())
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import asyncio
  import ipdb
  import unittest
  
  
  class Test(unittest.TestCase):
      def setUp(self):
          self.loop = asyncio.new_event_loop()
          asyncio.set_event_loop(None)
  
      def tearDown(self):
          self.loop.close()
  
      def test_sleep(self):
          @asyncio.coroutine
          def go():
             t0 = self.loop.time()
             yield from asyncio.sleep(0.5, loop=self.loop)
             t1 = self.loop.time()
             self.assertTrue(0.4 <= t1-t0 <= 0.6, t1-t0)
  
          self.loop.run_until_complete(go())
  
      def test_pythonasynciodebug(self):
          @asyncio.coroutine
          def go():
              asyncio.sleep(0.5, loop=self.loop)  # missed `yield from`
  
          self.loop.run_until_complete(go())
  
  
      def test_ipdb(self):
          @asyncio.coroutine
          def go():
              while True:
                  import ipdb; ipdb.set_trace()
                  yield from asyncio.sleep(60, loop=self.loop)
  
          self.loop.run_until_complete(go())
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add ipdb example