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Handle ImportError from multiprocessing module (#1400)
authorTerrance <4025899+Terrance@users.noreply.github.com>
Sat, 9 May 2020 16:22:23 +0000 (17:22 +0100)
committerGitHub <noreply@github.com>
Sat, 9 May 2020 16:22:23 +0000 (09:22 -0700)
Termux's Python environment doesn't provide sem_open, but fails with a
nested `ImportError` on import attempts:

    ImportError: cannot import name 'SemLock' from '_multiprocessing'

This updates the existing handling for AWS Lambda to catch both
`OSError` and `ImportError`.

src/black/__init__.py

index 3ab4bc76bb23836a1f12bbe4953a5fb6bcbd7b55..41c688b53998005c2a359c29a30d8cd2e59d91f8 100644 (file)
@@ -662,9 +662,9 @@ def reformat_many(
         worker_count = min(worker_count, 61)
     try:
         executor = ProcessPoolExecutor(max_workers=worker_count)
         worker_count = min(worker_count, 61)
     try:
         executor = ProcessPoolExecutor(max_workers=worker_count)
-    except OSError:
+    except (ImportError, OSError):
         # we arrive here if the underlying system does not support multi-processing
         # we arrive here if the underlying system does not support multi-processing
-        # like in AWS Lambda, in which case we gracefully fallback to
+        # like in AWS Lambda or Termux, in which case we gracefully fallback to
         # a ThreadPollExecutor with just a single worker (more workers would not do us
         # any good due to the Global Interpreter Lock)
         executor = ThreadPoolExecutor(max_workers=1)
         # a ThreadPollExecutor with just a single worker (more workers would not do us
         # any good due to the Global Interpreter Lock)
         executor = ThreadPoolExecutor(max_workers=1)