Great question! I’ve run into this exact issue with Peach Fuzzer (especially the GitLab protocol fuzzer variant) before—since a lot of the original codebase was built for Python 2.x, running it directly on Python 3 does take some manual work, as you’ve noticed there aren’t many step-by-step tutorials out there. Here’s how you can make it work:

• Code Migration & Syntax Fixes
  The core hurdle is Python 2 vs 3 syntax and type differences. Start with the 2to3 tool, a built-in Python utility that automatically converts most Python 2 code to Python 3-compatible syntax. Run this command in your Peach Fuzzer directory:

  2to3 -w path/to/peach-fuzzer/
  

  This will fix obvious issues like print statements → print() functions, xrange → range, and string type mismatches. After the auto-conversion, you’ll still need to manually tweak parts of the code—for example, adjusting imports that rely on Python 2-only modules, or fixing hardcoded unicode/str handling that breaks in Python 3.

• Dependency Updates
  Many of Peach Fuzzer’s dependencies (like twisted, protobuf, or pyopenssl) have Python 3-compatible versions, but the original setup might specify older, Python 2-only versions. Create a fresh Python 3 virtual environment first to avoid conflicts:

  python3 -m venv peach-py3-env
  # Activate on Linux/macOS
  source peach-py3-env/bin/activate
  # Activate on Windows
  peach-py3-env\Scripts\activate
  

  Then install the updated dependencies using pip, checking for any deprecated packages that need replacements. For example, if a legacy dependency is no longer maintained, you might need to modify the code to use a modern alternative.

• Check Community Forks/Ports
  While official documentation is sparse, some developers have forked the Peach Fuzzer repo and ported it to Python 3. Check the project’s GitHub/GitLab fork list or issue tracker for any existing Python 3-compatible branches. Just keep in mind these aren’t official, so you’ll want to test thoroughly to ensure the GitLab protocol fuzzing functionality works as expected.

• Fallback: Use Python 2 in Isolation
  If migration feels too time-consuming, you can run the original Python 2 code in an isolated environment (like a Docker container) to avoid exposing your system to unsupported Python 2. However, since Python 2 is end-of-life, this is only a temporary workaround and not recommended for long-term or production use.

To sum it up: Yes, it’s possible to run the GitLab Protocol Fuzzer variant of Peach Fuzzer on Python 3, but it requires code adjustments and dependency updates—there’s no one-click solution, but the steps above should get you started.

备注：内容来源于stack exchange，提问作者Farida Gayfutdinova