Fix pre-3.9 async imports

Author: NoahStapp

pymongo/asynchronous/helpers.py

@@ -70,8 +70,13 @@ async def inner(*args: Any, **kwargs: Any) -> Any:
 
 if sys.version_info >= (3, 10):
     anext = builtins.anext
+    aiter = builtins.aiter
 else:
 
     async def anext(cls: Any) -> Any:
         """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#anext."""
         return await cls.__anext__()
+
+    async def aiter(cls: Any) -> Any:
+        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#anext."""
+        return await cls.__aiter__()

pymongo/synchronous/helpers.py

@@ -70,8 +70,13 @@ def inner(*args: Any, **kwargs: Any) -> Any:
 
 if sys.version_info >= (3, 10):
     next = builtins.next
+    iter = builtins.iter
 else:
 
     def next(cls: Any) -> Any:
         """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#next."""
         return cls.__next__()
+
+    def iter(cls: Any) -> Any:
+        """Compatibility function until we drop 3.9 support: https://docs.python.org/3/library/functions.html#next."""
+        return cls.__iter__()