/usr/lib/python3/dist-packages/IPython/testing/plugin/ is in python3-ipython 5.5.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/IPython/testing/plugin/README.txt
/usr/lib/python3/dist-packages/IPython/testing/plugin/__init__.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/dtexample.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/ipdoctest.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/iptest.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/setup.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/show_refs.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/simple.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/simplevars.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/test_combo.txt
/usr/lib/python3/dist-packages/IPython/testing/plugin/test_example.txt
/usr/lib/python3/dist-packages/IPython/testing/plugin/test_exampleip.txt
/usr/lib/python3/dist-packages/IPython/testing/plugin/test_ipdoctest.py
/usr/lib/python3/dist-packages/IPython/testing/plugin/test_refs.py