# ERROR: Invalid requirement: 'package=<1.0.0'

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

## Root Cause

The version specifier uses an invalid operator '<=' is correct, but '=<' is not valid.

## 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)
   ```
   Refer to the packaging documentation.
   ```

## Dead Ends

- **** — Quoting does not fix the invalid operator. (90% fail)
- **** — Newer pip still enforces valid operators. (95% fail)
- **** — Force reinstall does not bypass parsing. (95% fail)