# sqlalchemy.exc.InvalidRequestError: This session is in 'closed' state. No operations are allowed.

- **ID:** `python/sqlalchemy-commit-rollback-session-closed`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Attempting to use a session after it has been closed.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **Create a new session instance.** (95% success)
   ```
   from sqlalchemy.orm import Session
new_session = Session(engine)
   ```
2. **Use context manager to auto-close.** (90% success)
   ```
   with Session(engine) as session:
    session.add(obj)
    session.commit()
   ```

## Dead Ends

- **Calling session.open() which does not exist.** — Session has no open method; must create new session. (90% fail)
- **Reassigning session variable to same closed object.** — Object still closed; operations fail. (80% fail)