gh-129403: Fix ValueError messages in asyncio.Barrier and threading.Barrier (#129419)

Co-authored-by: Peter Bierma <zintensitydev@gmail.com>

Author: StanFromIreland

Lib/asyncio/locks.py

@@ -485,7 +485,7 @@ class Barrier(mixins._LoopBoundMixin):
     def __init__(self, parties):
         """Create a barrier, initialised to 'parties' tasks."""
         if parties < 1:
-            raise ValueError('parties must be > 0')
+            raise ValueError('parties must be >= 1')
 
         self._cond = Condition() # notify all tasks when state changes
 

Lib/threading.py

@@ -694,7 +694,7 @@ def __init__(self, parties, action=None, timeout=None):
 
         """
         if parties < 1:
-            raise ValueError("parties must be > 0")
+            raise ValueError("parties must be >= 1")
         self._cond = Condition(Lock())
         self._action = action
         self._timeout = timeout

Misc/NEWS.d/next/Library/2025-01-29-17-10-00.gh-issue-129403.314159.rst

@@ -0,0 +1 @@
+Corrected :exc:`ValueError` message for :class:`asyncio.Barrier` and :class:`threading.Barrier`.