/usr/lib/python3.5/tkinter/ is in libpython3.5-stdlib 3.5.1-10.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3.5/tkinter/__init__.py
/usr/lib/python3.5/tkinter/__main__.py
/usr/lib/python3.5/tkinter/colorchooser.py
/usr/lib/python3.5/tkinter/commondialog.py
/usr/lib/python3.5/tkinter/constants.py
/usr/lib/python3.5/tkinter/dialog.py
/usr/lib/python3.5/tkinter/dnd.py
/usr/lib/python3.5/tkinter/filedialog.py
/usr/lib/python3.5/tkinter/font.py
/usr/lib/python3.5/tkinter/messagebox.py
/usr/lib/python3.5/tkinter/scrolledtext.py
/usr/lib/python3.5/tkinter/simpledialog.py
/usr/lib/python3.5/tkinter/tix.py
/usr/lib/python3.5/tkinter/ttk.py