[3.9] bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-12620)

Turn deprecation warnings added in 3.8 into TypeError.

1 files changed, 1 insertions, 17 deletions

diff --git a/Lib/concurrent/futures/process.py b/Lib/concurrent/futures/process.py
index dd14eaec907..cfdcd3ed7ea 100644
--- a/Lib/concurrent/futures/process.py
+++ b/Lib/concurrent/futures/process.py
@@ -608,22 +608,7 @@ class ProcessPoolExecutor(_base.Executor):
             p.start()
             self._processes[p.pid] = p
 
-    def submit(*args, **kwargs):
-        if len(args) >= 2:
-            self, fn, *args = args
-        elif not args:
-            raise TypeError("descriptor 'submit' of 'ProcessPoolExecutor' object "
-                            "needs an argument")
-        elif 'fn' in kwargs:
-            fn = kwargs.pop('fn')
-            self, *args = args
-            import warnings
-            warnings.warn("Passing 'fn' as keyword argument is deprecated",
-                          DeprecationWarning, stacklevel=2)
-        else:
-            raise TypeError('submit expected at least 1 positional argument, '
-                            'got %d' % (len(args)-1))
-
+    def submit(self, fn, /, *args, **kwargs):
         with self._shutdown_lock:
             if self._broken:
                 raise BrokenProcessPool(self._broken)
@@ -644,7 +629,6 @@ class ProcessPoolExecutor(_base.Executor):
 
             self._start_queue_management_thread()
             return f
-    submit.__text_signature__ = _base.Executor.submit.__text_signature__
     submit.__doc__ = _base.Executor.submit.__doc__
 
     def map(self, fn, *iterables, timeout=None, chunksize=1):