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Fix process pool fallback on Python 3.10 (GH-2631)
authorMatthew D. Scholefield <matthew331199@gmail.com>
Sat, 20 Nov 2021 19:25:30 +0000 (11:25 -0800)
committerGitHub <noreply@github.com>
Sat, 20 Nov 2021 19:25:30 +0000 (14:25 -0500)
In Python 3.10 the exception generated by creating a process pool on
a Python build that doesn't support this is now `NotImplementedError`

Commit history before merge:

* Fix process pool fallback on Python 3.10
* Update CHANGES.md
* Update CHANGES.md

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
CHANGES.md
src/black/__init__.py

index 35024de724d4adfd0121b8f0da9289570475711e..db519ac6bbc9a636fc1dd90de43f04f53c5f1ee5 100644 (file)
@@ -1,5 +1,11 @@
 # Change Log
 
 # Change Log
 
+## Unreleased
+
+### _Black_
+
+- Fixed Python 3.10 support on platforms without ProcessPoolExecutor (#2631)
+
 ## 21.11b1
 
 ### _Black_
 ## 21.11b1
 
 ### _Black_
index a5ddec9122105cae9393d126c92f3c3c5bfb3ec3..aa7970cfd6c443e90375e6c342185f74174dec4d 100644 (file)
@@ -687,7 +687,7 @@ def reformat_many(
         worker_count = min(worker_count, 60)
     try:
         executor = ProcessPoolExecutor(max_workers=worker_count)
         worker_count = min(worker_count, 60)
     try:
         executor = ProcessPoolExecutor(max_workers=worker_count)
-    except (ImportError, OSError):
+    except (ImportError, NotImplementedError, OSError):
         # we arrive here if the underlying system does not support multi-processing
         # like in AWS Lambda or Termux, in which case we gracefully fallback to
         # a ThreadPoolExecutor with just a single worker (more workers would not do us
         # we arrive here if the underlying system does not support multi-processing
         # like in AWS Lambda or Termux, in which case we gracefully fallback to
         # a ThreadPoolExecutor with just a single worker (more workers would not do us