/usr/share/pyshared/pygraph/algorithms/ is in python-pygraph 1.8.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/pygraph/algorithms/__init__.py
/usr/share/pyshared/pygraph/algorithms/accessibility.py
/usr/share/pyshared/pygraph/algorithms/critical.py
/usr/share/pyshared/pygraph/algorithms/cycles.py
/usr/share/pyshared/pygraph/algorithms/filters/
/usr/share/pyshared/pygraph/algorithms/filters/__init__.py
/usr/share/pyshared/pygraph/algorithms/filters/find.py
/usr/share/pyshared/pygraph/algorithms/filters/null.py
/usr/share/pyshared/pygraph/algorithms/filters/radius.py
/usr/share/pyshared/pygraph/algorithms/generators.py
/usr/share/pyshared/pygraph/algorithms/heuristics/
/usr/share/pyshared/pygraph/algorithms/heuristics/__init__.py
/usr/share/pyshared/pygraph/algorithms/heuristics/chow.py
/usr/share/pyshared/pygraph/algorithms/heuristics/euclidean.py
/usr/share/pyshared/pygraph/algorithms/minmax.py
/usr/share/pyshared/pygraph/algorithms/pagerank.py
/usr/share/pyshared/pygraph/algorithms/searching.py
/usr/share/pyshared/pygraph/algorithms/sorting.py
/usr/share/pyshared/pygraph/algorithms/traversal.py
/usr/share/pyshared/pygraph/algorithms/utils.py