# ERROR: ResolutionImpossible: ResolutionTooDeep: backtracking too deep (2000000 iterations)

- **ID:** `python/pip-dependency-resolution-too-deep`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

pip's resolver hit its backtracking limit while trying to satisfy a large, tightly constrained dependency graph. Usually caused by overly broad or conflicting version pins across many packages.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |
| 3.9 | active | — | — |
| 3.10 | active | — | — |
| 3.11 | active | — | — |
| 3.12 | active | — | — |

## Workarounds

1. **** (88% success)
   ```
   pip install pip-tools
pip-compile --resolver=backtracking requirements.in
pip install -r requirements.txt
   ```
2. **** (82% success)
   ```
   pip install -c constraints.txt core-deps
pip install -c constraints.txt app-deps
   ```

## Dead Ends

- **** — Legacy resolver picks versions greedily and produces an inconsistent environment that breaks at runtime. (85% fail)
- **** — Allowing pre-releases expands the search space and worsens backtracking. (80% fail)