Fix a few typos (#4131)

distributed/semaphore.py

@@ -386,7 +386,7 @@ def __init__(self, max_leases=1, name=None, client=None, register=True):
         self.client._periodic_callbacks[self._periodic_callback_name] = pc
 
         # Need to start the callback using IOLoop.add_callback to ensure that the
-        # PC uses the correct event lopp.
+        # PC uses the correct event loop.
         self.client.io_loop.add_callback(pc.start)
 
     def register(self):

distributed/tests/test_client.py

@@ -6130,7 +6130,7 @@ async def f():
 
 
 @pytest.mark.asyncio
-async def test_client_gather_semaphor_loop(cleanup):
+async def test_client_gather_semaphore_loop(cleanup):
     async with Scheduler(port=0) as s:
         async with Client(s.address, asynchronous=True) as c:
             assert c._gather_semaphore._loop is c.loop.asyncio_loop

distributed/tests/test_steal.py

@@ -149,7 +149,7 @@ async def test_dont_steal_fast_tasks_compute_time(c, s, *workers):
     def do_nothing(x, y=None):
         pass
 
-    # execute and meassure runtime once
+    # execute and measure runtime once
     await wait(c.submit(do_nothing, 1))
 
     futures = c.map(do_nothing, range(1000), y=x)
@@ -166,15 +166,15 @@ async def test_dont_steal_fast_tasks_blacklist(c, s, a, b):
     x = c.submit(slowinc, 1, workers=[b.address])
 
     # If the blacklist of fast tasks is tracked somewhere else, this needs to be
-    # changed. This test requies *any* key which is blacklisted.
+    # changed. This test requires *any* key which is blacklisted.
     from distributed.stealing import fast_tasks
 
     blacklisted_key = next(iter(fast_tasks))
 
     def fast_blacklisted(x, y=None):
         # The task should observe a certain computation time such that we can
         # ensure that it is not stolen due to the blacklisting. If it is too
-        # fast, the standard mechansim shouldn't allow stealing
+        # fast, the standard mechanism shouldn't allow stealing
         import time
 
         time.sleep(0.01)

docs/source/http_services.rst

@@ -2,7 +2,7 @@ HTTP endpoints
 ==============
 
 A subset of the following pages will be available from the scheduler or
-workers of a running cluster. The list of currently available endpoins can
+workers of a running cluster. The list of currently available endpoints can
 be found by examining ``/sitemap.json``.