Issue #23917: Fall back to sequential compilation when ProcessPoolExecutor doesn't exist.
Patch by Claudiu Popa.
diff --git a/Lib/compileall.py b/Lib/compileall.py
index aeaaf8e..64c0a9a 100644
--- a/Lib/compileall.py
+++ b/Lib/compileall.py
@@ -69,11 +69,9 @@
files = _walk_dir(dir, quiet=quiet, maxlevels=maxlevels,
ddir=ddir)
success = 1
- if workers is not None and workers != 1:
+ if workers is not None and workers != 1 and ProcessPoolExecutor is not None:
if workers < 0:
raise ValueError('workers must be greater or equal to 0')
- if ProcessPoolExecutor is None:
- raise NotImplementedError('multiprocessing support not available')
workers = workers or None
with ProcessPoolExecutor(max_workers=workers) as executor: