Exit cleanly the interactive client on ^C.

Fix #1599.

Author: aaugustin

src/websockets/cli.py

@@ -121,9 +121,15 @@ async def interactive_client(uri: str) -> None:
  try:
  await asyncio.wait(
  [incoming, outgoing],
+ # Clean up and exit when the server closes the connection
+ # or the user enters EOT (^D), whichever happens first.
  return_when=asyncio.FIRST_COMPLETED,
  )
- except (KeyboardInterrupt, EOFError): # ^C, ^D # pragma: no cover
+ # asyncio.run() cancels the main task when the user triggers SIGINT (^C).
+ # https://docs.python.org/3/library/asyncio-runner.html#handling-keyboard-interruption
+ # Clean up and exit without re-raising CancelledError to prevent Python
+ # from raising KeyboardInterrupt and displaying a stack track.
+ except asyncio.CancelledError: # pragma: no cover
  pass
  finally:
  incoming.cancel()
@@ -165,4 +171,8 @@ def main(argv: list[str] | None = None) -> None:
  except ImportError: # readline isn't available on all platforms
  pass
 
- asyncio.run(interactive_client(args.uri))
+ # Remove the try/except block when dropping Python < 3.11.
+ try:
+ asyncio.run(interactive_client(args.uri))
+ except KeyboardInterrupt: # pragma: no cover
+ pass