# sqlalchemy.exc.NoSuchModuleError: Can't load plugin: sqlalchemy.dialects:postgresql.psycopg3

- **ID:** `python/sqlalchemy-connection-string-missing-driver`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The specified database driver is not installed or not recognized by SQLAlchemy.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 1.4.x | active | — | — |
| 2.0.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   Install the correct driver: pip install psycopg2-binary or pip install psycopg (for v3)
   ```
2. **** (90% success)
   ```
   Use the correct dialect string: 'postgresql+psycopg2://user:pass@host/db'
   ```

## Dead Ends

- **** — Defaults to psycopg2; if that's not installed, it fails. (80% fail)
- **** — Missing dependency. (90% fail)