/usr/lib/python3/dist-packages/sqlalchemy/ext/ is in python3-sqlalchemy 1.1.11+ds1-1ubuntu1.
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/usr/lib/python3/dist-packages/sqlalchemy/ext/__init__.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/associationproxy.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/automap.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/baked.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/compiler.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/
/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/__init__.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/api.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/base.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/declarative/clsregistry.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/horizontal_shard.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/hybrid.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/indexable.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/instrumentation.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/mutable.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/orderinglist.py
/usr/lib/python3/dist-packages/sqlalchemy/ext/serializer.py