# ERROR: Could not find a version that satisfies the requirement mypackage[extra] (from versions: none)

- **ID:** `python/pip-requirements-extras-not-found`
- **Domain:** python
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The specified extra (e.g., [extra]) does not exist for the package on PyPI.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |

## Workarounds

1. **Check the package's available extras on PyPI** (95% success)
   ```
   Visit https://pypi.org/project/mypackage/ or run `pip show mypackage` to see the list of extras.
   ```
2. **Install the package without extras and manually add dependencies** (80% success)
   ```
   `pip install mypackage` then `pip install dependency1 dependency2` (as listed in the package's documentation).
   ```

## Dead Ends

- **Assuming the extra is misspelled and trying random variations** — Without knowing the correct extra name, guesses are unlikely to succeed. (70% fail)
- **Installing the package without the extra** — This may miss required dependencies for the desired functionality. (30% fail)