Merge from 3.3: Issue #17390

Lib/idlelib/NEWS.txt

 What's New in IDLE 3.4.0?
 =========================
 
+- Issue #17390: Display Python version on Idle title bar.
+  Initial patch by Edmond Burnett.
+
 - Issue #5066: Update IDLE docs. Patch by Todd Rovito.
 
 - Issue #16226: Fix IDLE Path Browser crash.

Lib/idlelib/PyShell.py

@@ -16,6 +16,7 @@ import io
 
 import linecache
 from code import InteractiveInterpreter
+from platform import python_version
 
 try:
     from tkinter import *
@@ -799,7 +800,7 @@ class ModifiedInterpreter(InteractiveInterpreter):
 
 class PyShell(OutputWindow):
 
-    shell_title = "Python Shell"
+    shell_title = "Python " + python_version() + " Shell"
 
     # Override classes
     ColorDelegator = ModifiedColorDelegator