# ERROR: Invalid requirement: 'package==1.0.0.0'

- **ID:** `python/pip-invalid-requirement-malformed`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The version specifier in the requirement string is malformed or uses an invalid version format that packaging.version cannot parse.

## Version Compatibility

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

## Workarounds

1. **** (99% success)
   ```
   pip install package==1.0.0
   ```
2. **** (90% success)
   ```
   pip install 'package~=1.0.0'
   ```
3. **** (85% success)
   ```
   pip index versions package
   ```

## Dead Ends

- **** — The issue is the version string itself, not shell quoting. (80% fail)
- **** — Newer pip still enforces valid version syntax. (90% fail)
- **** — Force reinstall does not bypass requirement parsing. (95% fail)