/usr/lib/python2.7/dist-packages/libmproxy/proxy/ is in mitmproxy 0.15-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/libmproxy/proxy/__init__.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/config.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/__init__.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/http_proxy.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/reverse_proxy.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/socks_proxy.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/modes/transparent_proxy.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/root_context.py
/usr/lib/python2.7/dist-packages/libmproxy/proxy/server.py