commit 0db6c143ae5f04d223fdb2c94b820f16714b0a09
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Jul 30 10:12:05 2021 -0700
committer GitHub <noreply@github.com> Fri Jul 30 19:12:05 2021 +0200
tree c25d7cd28da2d1a7eadbb0aba3c25f202d6aaf49
parent 6e6dc2517379289932c68fc986ee3994468374fc

bpo-44666: Use default encoding as fallback for compile_file (GH-27236) (GH-27488)

When sys.stdout.encoding is None compile_file will fall back to
sys.getdefaultencoding to encode/decode error messages.

Co-authored-by: Stefan Hoelzl <stefan.hoelzl@posteo.de>
Co-authored-by: Mickaël Schoentgen <contact@tiger-222.fr>
(cherry picked from commit 80f07076294bc09a55ed76d9bbf307404eef25e6)

Lib/compileall.py

diff --git a/Lib/compileall.py b/Lib/compileall.py
index 61b4c5c..454465b 100644
--- a/Lib/compileall.py
+++ b/Lib/compileall.py
@@ -254,9 +254,8 @@ def compile_file(fullname, ddir=None, force=False, rx=None, quiet=0,
                 else:
                     print('*** ', end='')
                 # escape non-printable characters in msg
-                msg = err.msg.encode(sys.stdout.encoding,
-                                     errors='backslashreplace')
-                msg = msg.decode(sys.stdout.encoding)
+                encoding = sys.stdout.encoding or sys.getdefaultencoding()
+                msg = err.msg.encode(encoding, errors='backslashreplace').decode(encoding)
                 print(msg)
             except (SyntaxError, UnicodeError, OSError) as e:
                 success = False