# ERROR: Cannot install package==1.0 and package==2.0 because these package versions have conflicting dependencies.

- **ID:** `python/pip-requirement-already-satisfied-conflict`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The user explicitly requested two mutually exclusive versions of the same package, or a dependency requires a version incompatible with the pinned one.

## Version Compatibility

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

## Workarounds

1. **** (85% success)
   ```
   pip install package==2.0  # then update other packages as needed
   ```
2. **** (80% success)
   ```
   echo 'package==2.0' > constraints.txt; pip install -c constraints.txt other-package
   ```

## Dead Ends

- **** — Does not resolve version conflict; the resolver still cannot satisfy both constraints. (95% fail)
- **** — pip will not install conflicting versions; the command exits with an error. (90% fail)