Remove pep484 type comments from the code

Current effort is around the stub package, and having typing in
two places makes thing worse, since the types here are usually
outdated compared to the version in the stubs.

Once v2 gets under way we can start consolidating the types
here.

Fixes: #6461

Change-Id: I7132a444bd7138123074bf5bc664b4bb119a85ce

1 files changed, 12 insertions, 30 deletions

diff --git a/lib/sqlalchemy/ext/asyncio/session.py b/lib/sqlalchemy/ext/asyncio/session.py
index 1b61d6ee3..8d19819b0 100644
--- a/lib/sqlalchemy/ext/asyncio/session.py
+++ b/lib/sqlalchemy/ext/asyncio/session.py
@@ -4,27 +4,14 @@
 #
 # This module is part of SQLAlchemy and is released under
 # the MIT License: http://www.opensource.org/licenses/mit-license.php
-
-from typing import Any
-from typing import Callable
-from typing import Mapping
-from typing import Optional
-from typing import TypeVar
-
 from . import engine
 from . import result as _result
 from .base import StartableContext
-from .engine import AsyncEngine
 from ... import util
-from ...engine import Result
 from ...orm import Session
-from ...sql import Executable
 from ...util.concurrency import greenlet_spawn
 
 
-T = TypeVar("T")
-
-
 @util.create_proxy_methods(
     Session,
     ":class:`_orm.Session`",
@@ -72,12 +59,7 @@ class AsyncSession:
 
     dispatch = None
 
-    def __init__(
-        self,
-        bind: AsyncEngine = None,
-        binds: Mapping[object, AsyncEngine] = None,
-        **kw
-    ):
+    def __init__(self, bind=None, binds=None, **kw):
         kw["future"] = True
         if bind:
             self.bind = bind
@@ -114,7 +96,7 @@ class AsyncSession:
             with_for_update=with_for_update,
         )
 
-    async def run_sync(self, fn: Callable[..., T], *arg, **kw) -> T:
+    async def run_sync(self, fn, *arg, **kw):
         """Invoke the given sync callable passing sync self as the first
         argument.
 
@@ -143,12 +125,12 @@ class AsyncSession:
 
     async def execute(
         self,
-        statement: Executable,
-        params: Optional[Mapping] = None,
-        execution_options: Mapping = util.EMPTY_DICT,
-        bind_arguments: Optional[Mapping] = None,
+        statement,
+        params=None,
+        execution_options=util.EMPTY_DICT,
+        bind_arguments=None,
         **kw
-    ) -> Result:
+    ):
         """Execute a statement and return a buffered
         :class:`_engine.Result` object."""
 
@@ -165,12 +147,12 @@ class AsyncSession:
 
     async def scalar(
         self,
-        statement: Executable,
-        params: Optional[Mapping] = None,
-        execution_options: Mapping = util.EMPTY_DICT,
-        bind_arguments: Optional[Mapping] = None,
+        statement,
+        params=None,
+        execution_options=util.EMPTY_DICT,
+        bind_arguments=None,
         **kw
-    ) -> Any:
+    ):
         """Execute a statement and return a scalar result."""
 
         result = await self.execute(