From 353f8d2282b1a48376f8813fd1170445a0cda873 Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Mon, 13 May 2019 18:29:15 -0400
Subject: [PATCH] [2.7] bpo-36807: When saving a file in IDLE, call flush and
 fsync (GH-13102) (GH-13293)

---
 Lib/idlelib/IOBinding.py                                       | 2 ++
 Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst | 1 +
 2 files changed, 3 insertions(+)
 create mode 100644 Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst

diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
index 2aba46e0df4..872bece4767 100644
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -383,6 +383,8 @@ class IOBinding:
         try:
             with open(filename, "wb") as f:
                 f.write(chars)
+                f.flush()
+                os.fsync(f.fileno())
             return True
         except IOError as msg:
             tkMessageBox.showerror("I/O Error", str(msg),
diff --git a/Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst b/Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst
new file mode 100644
index 00000000000..2a905bf0eec
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2019-05-05-16-27-53.bpo-13102.AGNWYJ.rst
@@ -0,0 +1 @@
+When saving a file, call os.fsync() so bits are flushed to e.g. USB drive.