# packaging.specifiers.InvalidSpecifier: Invalid specifier: '>=1.0,<2.0'

- **ID:** `python/packaging-specifier-set-error`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The specifier string contains a comma, which is not allowed; specifiers must be separated by spaces or passed as a list.

## Version Compatibility

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

## Workarounds

1. **** (95% success)
   ```
   SpecifierSet('>=1.0 <2.0')
   ```
2. **** (90% success)
   ```
   SpecifierSet(['>=1.0', '<2.0'])
   ```

## Dead Ends

- **** — Semicolons are also not valid separators in specifiers. (90% fail)
- **** — Quoting does not change the invalid syntax. (100% fail)