Cannot unpack Row instance

Describe the bug mypy is complaining about unpacking Row object, even though it works.

To Reproduce

test_table = Table(
    "test_table",
    metadata,
    Column("i", UUID(as_uuid=True), nullable=False, primary_key=True),
    Column("x", UUID(as_uuid=True), index=True),
    Column("y", UUID(as_uuid=True), index=True),
)
query = test_table.select()
async with engine.connect() as connection:
  result = await connection.execute(query)
row = result.fetchone()
if row:
  my_dict = {**row}

Error

Argument after ** must be a mapping, not "Row"

Versions.

• OS: Linux Mint 19.3 Cinnamon
• Python: 3.7.10
• SQLAlchemy: 1.4.15
• Database: PostgreSQL
• DBAPI: asyncpg

[bryanforbes]

I’d have to look into it, but off the top of my head I don’t know of a way to do it.

[zzzeek]

Well, that’s true. Now I am biased since I know I should move away from treating Row as Mapping.

Just a note, there seem to be no deprecation warning in my case. 😦

you need to turn on SQLALCHEMY_WARN_20 and also use Python -Walways or equivalent: https://docs.sqlalchemy.org/en/14/changelog/migration_20.html#migration-to-2-0-step-two-turn-on-removedin20warnings