/usr/lib/python3.6/tkinter/ is in python3-tk 3.6.5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3.6/tkinter/__init__.py
/usr/lib/python3.6/tkinter/__main__.py
/usr/lib/python3.6/tkinter/colorchooser.py
/usr/lib/python3.6/tkinter/commondialog.py
/usr/lib/python3.6/tkinter/constants.py
/usr/lib/python3.6/tkinter/dialog.py
/usr/lib/python3.6/tkinter/dnd.py
/usr/lib/python3.6/tkinter/filedialog.py
/usr/lib/python3.6/tkinter/font.py
/usr/lib/python3.6/tkinter/messagebox.py
/usr/lib/python3.6/tkinter/scrolledtext.py
/usr/lib/python3.6/tkinter/simpledialog.py
/usr/lib/python3.6/tkinter/tix.py
/usr/lib/python3.6/tkinter/ttk.py