Index: Lib/tkinter/__main__.py
===================================================================
--- Lib/tkinter/__main__.py	(revision 0)
+++ Lib/tkinter/__main__.py	(revision 0)
@@ -0,0 +1,7 @@
+"""Main entry point"""
+
+import sys
+if sys.argv[0].endswith("__main__.py"):
+    sys.argv[0] = "python -m tkinter"
+from . import _test as main
+main()