/usr/lib/python2.7/lib-tk/ is in libpython2.7-stdlib 2.7.15~rc1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/lib-tk/Canvas.py
/usr/lib/python2.7/lib-tk/Dialog.py
/usr/lib/python2.7/lib-tk/FileDialog.py
/usr/lib/python2.7/lib-tk/FixTk.py
/usr/lib/python2.7/lib-tk/ScrolledText.py
/usr/lib/python2.7/lib-tk/SimpleDialog.py
/usr/lib/python2.7/lib-tk/Tix.py
/usr/lib/python2.7/lib-tk/Tkconstants.py
/usr/lib/python2.7/lib-tk/Tkdnd.py
/usr/lib/python2.7/lib-tk/Tkinter.py
/usr/lib/python2.7/lib-tk/tkColorChooser.py
/usr/lib/python2.7/lib-tk/tkCommonDialog.py
/usr/lib/python2.7/lib-tk/tkFileDialog.py
/usr/lib/python2.7/lib-tk/tkFont.py
/usr/lib/python2.7/lib-tk/tkMessageBox.py
/usr/lib/python2.7/lib-tk/tkSimpleDialog.py
/usr/lib/python2.7/lib-tk/ttk.py
/usr/lib/python2.7/lib-tk/turtle.py