Python > 3.6, and various post-review changes

aiodataloader.py

@@ -1,3 +1,5 @@
+import sys
+
 from asyncio import AbstractEventLoop, Future
 from asyncio import gather, ensure_future, get_event_loop, iscoroutine, iscoroutinefunction
 from collections import namedtuple
@@ -16,26 +18,38 @@
     TypeVar,
     Union,
 )
-from typing_extensions import Protocol, TypeGuard
 
-__version__ = '0.2.1'
+if sys.version_info >= (3, 8):
+    from typing import Protocol
+else:
+    from typing_extensions import Protocol
 
+if sys.version_info >= (3, 10):
+    from typing import TypeGuard
+else:
+    from typing_extensions import TypeGuard
 
-def iscoroutinefunctionorpartial(fn: Callable) -> TypeGuard[Callable[..., Coroutine]]:
-    return iscoroutinefunction(fn.func if isinstance(fn, partial) else fn)
+__version__ = '0.2.1'
 
 
 KeyT = TypeVar("KeyT")
 ReturnT = TypeVar("ReturnT")
 CacheKeyT = TypeVar("CacheKeyT")
-DataLoaderT = TypeVar("DataLoaderT", bound="DataLoader")
+DataLoaderT = TypeVar("DataLoaderT", bound="DataLoader[Any, Any]")
 T = TypeVar("T")
 
 
+def iscoroutinefunctionorpartial(
+    fn: Union[Callable[..., ReturnT], "partial[ReturnT]"],
+) -> TypeGuard[Callable[..., Coroutine[Any, Any, ReturnT]]]:
+    return iscoroutinefunction(fn.func if isinstance(fn, partial) else fn)
+
+
 class BatchLoadFnProto(Protocol[KeyT, ReturnT]):
     async def __call__(self, keys: List[KeyT]) -> List[ReturnT]:
         ...
 
+
 Loader = namedtuple('Loader', 'key,future')
 
 
@@ -52,7 +66,7 @@ def __init__(
         max_batch_size: Optional[int] = None,
         cache: Optional[bool] = None,
         get_cache_key: Optional[Callable[[KeyT], Union[CacheKeyT, KeyT]]] = None,
-        cache_map: Optional[Dict[Union[CacheKeyT, KeyT], Any]] = None,
+        cache_map: Optional[Dict[Union[CacheKeyT, KeyT], "Future[ReturnT]"]] = None,
         loop: Optional[AbstractEventLoop] = None,
     ):
         self.loop = loop or get_event_loop()
@@ -188,7 +202,7 @@ def prime(self: DataLoaderT, key: KeyT, value: ReturnT) -> DataLoaderT:
         return self
 
 
-def enqueue_post_future_job(loop: AbstractEventLoop, loader: DataLoader) -> None:
+def enqueue_post_future_job(loop: AbstractEventLoop, loader: DataLoader[Any, Any]) -> None:
     async def dispatch() -> None:
         dispatch_queue(loader)
 
@@ -200,7 +214,7 @@ def get_chunks(iterable_obj: List[T], chunk_size: int = 1) -> Iterator[List[T]]:
     return (iterable_obj[i:i + chunk_size] for i in range(0, len(iterable_obj), chunk_size))
 
 
-def dispatch_queue(loader: DataLoader) -> None:
+def dispatch_queue(loader: DataLoader[Any, Any]) -> None:
     """
     Given the current state of a Loader instance, perform a batch load
     from its current queue.
@@ -224,7 +238,7 @@ def dispatch_queue(loader: DataLoader) -> None:
         ensure_future(dispatch_queue_batch(loader, queue))
 
 
-async def dispatch_queue_batch(loader: DataLoader, queue: List[Loader]) -> None:
+async def dispatch_queue_batch(loader: DataLoader[Any, Any], queue: List[Loader]) -> None:
     # Collect all keys to be loaded in this dispatch
     keys = [ql.key for ql in queue]
 
@@ -275,7 +289,7 @@ async def dispatch_queue_batch(loader: DataLoader, queue: List[Loader]) -> None:
         return failed_dispatch(loader, queue, e)
 
 
-def failed_dispatch(loader: DataLoader, queue: List[Loader], error: Exception) -> None:
+def failed_dispatch(loader: DataLoader[Any, Any], queue: List[Loader], error: Exception) -> None:
     """
     Do not cache individual loads if the entire batch dispatch fails,
     but still reject each request so they do not hang.

setup.cfg

@@ -6,3 +6,4 @@ max-line-length = 120
 files = aiodataloader.py, test_aiodataloader.py
 follow_imports = silent
 ignore_missing_imports = True
+strict = True

setup.py

@@ -38,7 +38,6 @@ def get_version(filename):
         'Intended Audience :: Developers',
         'Topic :: Software Development :: Libraries',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
@@ -48,6 +47,7 @@ def get_version(filename):
     ],
     keywords='concurrent future deferred aiodataloader',
     py_modules=['aiodataloader'],
+    python_requires='>=3.6',
     extras_require={
         'lint': ['flake8', 'mypy'],
         'test': tests_require,