bpo-25066: Added repr for multiprocessing.Event

Lib/multiprocessing/synchronize.py

@@ -353,6 +353,9 @@ def wait(self, timeout=None):
                 return True
             return False
 
+    def __repr__(self) -> str:
+        set_status = 'set' if self.is_set() else 'unset'
+        return f"<{type(self).__qualname__} at {id(self):#x} {set_status}>"
 #
 # Barrier
 #

Lib/test/_test_multiprocessing.py

@@ -1645,7 +1645,20 @@ def test_event(self):
         self.assertEqual(wait(), True)
         p.join()
 
-#
+    def test_repr(self) -> None:
+        event = self.Event()
+        if self.TYPE == 'processes':
+            self.assertRegex(repr(event), r"<Event at .* unset>")
+            event.set()
+            self.assertRegex(repr(event), r"<Event at .* set>")
+            event.clear()
+            self.assertRegex(repr(event), r"<Event at .* unset>")
+        elif self.TYPE == 'manager':
+            self.assertRegex(repr(event), r"<EventProxy object, typeid 'Event' at .*")
+            event.set()
+            self.assertRegex(repr(event), r"<EventProxy object, typeid 'Event' at .*")
+
+
 # Tests for Barrier - adapted from tests in test/lock_tests.py
 #
 

Misc/NEWS.d/next/Library/2021-11-24-12-25-42.bpo-25066.YIcIkn.rst

@@ -0,0 +1 @@
+Added a :meth:`__repr__` method to  :class:`multiprocessing.Event` objects, patch by Kumar Aditya.