# ERROR: Cannot install package-a==1.0 and package-b==2.0 because these package versions have conflicting dependencies. The conflict is caused by: package-a 1.0 depends on package-c[extra1]>=3.0 and package-b 2.0 depends on package-c[extra2]>=3.0. To fix this, you could try to: 1. loosen the range of package versions you've specified. 2. remove package versions to allow pip to attempt to solve the dependency conflict.

- **ID:** `pip/dependency-conflict-with-extras-syntax`
- **Domain:** pip
- **Category:** config_error
- **Error Code:** `ERROR`
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

Two packages require different extras of the same dependency package, and pip's resolver cannot install both extras simultaneously without a combined extra, leading to a dependency conflict.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| pip 23.0 | active | — | — |
| pip 23.3 | active | — | — |
| pip 24.1 | active | — | — |

## Workarounds

1. **Install the conflicting dependency with both extras using a combined specifier: pip install 'package-c[extra1,extra2]>=3.0' and then install the conflicting packages without version pins: pip install package-a package-b** (80% success)
   ```
   Install the conflicting dependency with both extras using a combined specifier: pip install 'package-c[extra1,extra2]>=3.0' and then install the conflicting packages without version pins: pip install package-a package-b
   ```
2. **Create a virtual environment and use pip-compile (from pip-tools) to generate a resolved requirements.txt that includes both extras: pip-compile --extra=extra1 --extra=extra2 requirements.in** (85% success)
   ```
   Create a virtual environment and use pip-compile (from pip-tools) to generate a resolved requirements.txt that includes both extras: pip-compile --extra=extra1 --extra=extra2 requirements.in
   ```
3. **Contact the maintainer of package-c to request a combined extra that includes both extra1 and extra2, or use a fork that merges them.** (30% success)
   ```
   Contact the maintainer of package-c to request a combined extra that includes both extra1 and extra2, or use a fork that merges them.
   ```

## Dead Ends

- **Installing package-c[extra1,extra2] manually before the conflicting packages** — Pip's resolver still sees the conflict because it evaluates the full dependency tree; manual pre-installation does not override the resolver's logic and may lead to an inconsistent state. (85% fail)
- **Using --ignore-dependencies flag to force installation** — This can cause runtime import errors or broken functionality because the required extras are not installed correctly. (90% fail)
- **Downgrading both packages to versions that don't use extras** — Such versions may not exist or may introduce other security or compatibility issues. (60% fail)