sqlalchemy/orm, sqlalchemy/event, sqlalchemy/testing Conflicts: lib/sqlalchemy/dialects/mssql/base.py lib/sqlalchemy/dialects/mysql/base.py lib/sqlalchemy/dialects/mysql/mysqldb.py lib/sqlalchemy/dialects/oracle/base.py lib/sqlalchemy/dialects/sybase/base.py lib/sqlalchemy/orm/attributes.py lib/sqlalchemy/orm/evaluator.py lib/sqlalchemy/orm/identity.py lib/sqlalchemy/orm/instrumentation.py lib/sqlalchemy/orm/loading.py lib/sqlalchemy/orm/mapper.py lib/sqlalchemy/orm/session.py lib/sqlalchemy/orm/sync.py lib/sqlalchemy/sql/compiler.py lib/sqlalchemy/sql/selectable.py lib/sqlalchemy/testing/requirements.py lib/sqlalchemy/testing/suite/test_select.py
to get all flake8 passing
AttributeErrors or KeyErrors that should raise during mapper configuration due to user errors. The catch for attribute/keyerror has been made more specific to not include the configuration step. fixes #3047
to disable autoflush, in the case that the attribute needs to lazy-load the "old" value, as in when replacing one-to-one values or some kinds of many-to-one. A flush at this point otherwise occurs at the point that the attribute is None and can cause NULL violations. [ticket:2921]
When the class_ passed is not a mapped class but is actually an iterable, the string formatting operation fails with a TypeError, and the expected ArgumentError is not raised. Calling code which is using reflection and expects this error will fail (e.g. the sadisplay module).