Fix for #1415 pythonw.exe fails because std streams a missing
After a long discussion about the problem with Windows GUI apps Guido decided that sys.stdin, stdout and stderr should be None when the C runtime library returns invalid file descriptors for the standard streams.
So far the only known cases are Windows GUI apps and scripts started with pythonw on Windows. The OS restrictions are tight enough to catch the problem on other OSes.
diff --git a/Misc/NEWS b/Misc/NEWS
index c79b531..f68ac90 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -34,6 +34,11 @@
- Added a new option -b to issues warnings (-bb for errors) about certain
operations between bytes/buffer and str like str(b'') and comparsion.
+- The standards streams sys.stdin, stdout and stderr may be None when the
+ when the C runtime library returns an invalid file descriptor for the
+ streams (fileno(stdin) < 0). For now this happens only for Windows GUI
+ apps and scripts started with `pythonw.exe`.
+
Extension Modules
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