anext() didn't become a builtin in Python 3.7

Author: Cito

graphql/pyutils/event_emitter.py

@@ -1,6 +1,6 @@
 from typing import Callable, Dict, List
 
-from asyncio import Queue, ensure_future
+from asyncio import AbstractEventLoop, Queue, ensure_future
 from inspect import isawaitable
 
 from collections import defaultdict
@@ -11,7 +11,7 @@
 class EventEmitter:
     """A very simple EventEmitter."""
 
-    def __init__(self, loop=None) -> None:
+    def __init__(self, loop: AbstractEventLoop=None) -> None:
         self.loop = loop
         self.listeners: Dict[str, List[Callable]] = defaultdict(list)
 

tests/subscription/test_map_async_iterator.py

@@ -5,13 +5,9 @@
 
 from graphql.subscription.map_async_iterator import MapAsyncIterator
 
-try:
-    # noinspection PyUnresolvedReferences,PyUnboundLocalVariable
-    anext
-except NameError:  # anext does not yet exist in Python 3.6
-    async def anext(iterable):
-        """Return the next item from an async iterator."""
-        return await iterable.__anext__()
+async def anext(iterable):
+    """Return the next item from an async iterator."""
+    return await iterable.__anext__()
 
 
 def describe_map_async_iterator():

tests/subscription/test_subscribe.py

@@ -28,13 +28,9 @@
     'inbox': GraphQLField(InboxType)})
 
 
-try:
-    # noinspection PyUnresolvedReferences,PyUnboundLocalVariable
-    anext
-except NameError:  # anext does not yet exist in Python 3.6
-    async def anext(iterable):
-        """Return the next item from an async iterator."""
-        return await iterable.__anext__()
+async def anext(iterable):
+    """Return the next item from an async iterator."""
+    return await iterable.__anext__()
 
 
 def email_schema_with_resolvers(subscribe_fn=None, resolve_fn=None):