/usr/lib/python3.6/tkinter/__main__.py is in python3-tk 3.6.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 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()
|