Always reconfigure stdout

On Windows sys.stdout uses the surrogateescape error handler, which fails
on lone surrogates produced by os.fsdecode().

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/inspect.py

@@ -3463,8 +3463,7 @@ def _main():
 
     # The printed text can contain characters unencodable in the encoding
     # of stdout, e.g. undecodable bytes of a file name.
-    if getattr(sys.stdout, 'errors', None) == 'strict':
-        sys.stdout.reconfigure(errors='backslashreplace')
+    sys.stdout.reconfigure(errors='backslashreplace')
 
     parser = argparse.ArgumentParser()
     parser.add_argument(

Misc/NEWS.d/next/Library/2026-08-05-17-30-00.gh-issue-69370.inspCLI.rst

@@ -1,4 +1,4 @@
-``python -m inspect --details`` no longer fails with
+:program:`python -m inspect --details` no longer fails with
 :exc:`UnicodeEncodeError` if the path of the module contains characters
 unencodable in the encoding of :data:`sys.stdout`.  Such characters are now
 escaped with backslashes.