from typing import Generator
from sqlalchemy.orm import Session
from app.api.db.database import SessionLocal
def get_db() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()
```
This code defines a `get_db` function that returns a generator function. The generator function creates a new SQLAlchemy session using `SessionLocal` from `app.api.db.database` and yields the session. After the session is used, it is closed in the `finally` block.
The function signature `get_db() -> Generator[Session, None, None]` specifies that the function returns a generator that yields a `Session` object and does not receive or return any values.
This function is typically used as a dependency in FastAPI routes to provide a database session for querying and modifying data.