1 files changed, 17 insertions, 2 deletions
diff --git a/Lib/asyncio/tasks.py b/Lib/asyncio/tasks.py
index cd4832cfee..a0cb884eac 100644
--- a/Lib/asyncio/tasks.py
+++ b/Lib/asyncio/tasks.py
@@ -573,10 +573,17 @@ def as_completed(fs, *, loop=None, timeout=None):
     """
     if futures.isfuture(fs) or coroutines.iscoroutine(fs):
         raise TypeError(f"expect a list of futures, not {type(fs).__name__}")
-    loop = loop if loop is not None else events.get_event_loop()
-    todo = {ensure_future(f, loop=loop) for f in set(fs)}
+
     from .queues import Queue  # Import here to avoid circular import problem.
     done = Queue(loop=loop)
+
+    if loop is None:
+        loop = events.get_event_loop()
+    else:
+        warnings.warn("The loop argument is deprecated since Python 3.8, "
+                      "and scheduled for removal in Python 3.10.",
+                      DeprecationWarning, stacklevel=2)
+    todo = {ensure_future(f, loop=loop) for f in set(fs)}
     timeout_handle = None
 
     def _on_timeout():
@@ -733,6 +740,10 @@ def gather(*coros_or_futures, loop=None, return_exceptions=False):
     if not coros_or_futures:
         if loop is None:
             loop = events.get_event_loop()
+        else:
+            warnings.warn("The loop argument is deprecated since Python 3.8, "
+                          "and scheduled for removal in Python 3.10.",
+                          DeprecationWarning, stacklevel=2)
         outer = loop.create_future()
         outer.set_result([])
         return outer
@@ -842,6 +853,10 @@ def shield(arg, *, loop=None):
         except CancelledError:
             res = None
     """
+    if loop is not None:
+        warnings.warn("The loop argument is deprecated since Python 3.8, "
+                      "and scheduled for removal in Python 3.10.",
+                      DeprecationWarning, stacklevel=2)
     inner = ensure_future(arg, loop=loop)
     if inner.done():
         # Shortcut.