Issue #18571: Implementation of the PEP 446: file descriptors and file handles
are now created non-inheritable; add functions os.get/set_inheritable(),
os.get/set_handle_inheritable() and socket.socket.get/set_inheritable().
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
index 137ebcb..7ce86a4 100644
--- a/Lib/_pyio.py
+++ b/Lib/_pyio.py
@@ -129,6 +129,8 @@
be kept open when the file is closed. This does not work when a file name is
given and must be True in that case.
+ The newly created file is non-inheritable.
+
A custom opener can be used by passing a callable as *opener*. The
underlying file descriptor for the file object is then obtained by calling
*opener* with (*file*, *flags*). *opener* must return an open file