Feature Request: Support for Python 3.5+ and Legacy Installation Option

[rahlk]

Description:

Expand compatibility to support Python versions 3.5 and above. Additionally, provide a legacy installation option via pip (pip install codeanalyzer[legacy]) to ensure backward compatibility for older Python environments.

Proposed Changes:

1. Compatibility Updates:

   • Refactor codebase to ensure compatibility with Python 3.5+.
   • Replace or conditionally handle features incompatible with Python 3.5 (e.g., type hints, f-strings).

2. Legacy Installation:

   • Add a legacy extra in pyproject.toml for dependencies compatible with Python 3.5.
   • Ensure the codeanalyzer[legacy] installation includes all necessary adjustments for older environments.

3. Testing:

   • Set up CI pipelines to test compatibility across Python versions 3.5 to 3.12+.
   • Include legacy-specific tests to verify functionality in older environments.

CLI and Documentation Updates:

• Update the README to reflect Python 3.5+ support and the legacy installation option.
• Add examples for installing and using the legacy version:

  pip install codeanalyzer[legacy]

[rahlk]

The best we can do is support 3.9+