/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/ is in python3-sqlalchemy 1.0.15+ds1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/__init__.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/base.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/cymysql.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/gaerdbms.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/mysqlconnector.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/mysqldb.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/oursql.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/pymysql.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/pyodbc.py
/usr/lib/python3/dist-packages/sqlalchemy/dialects/mysql/zxjdbc.py