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PyPy is doing really well on compatibility these days. It can use all the C libraries natively, and a lot of the speed issues there have been resolved.

• chrisseaton 8y ago
  > It can use all the C libraries natively Literally all of them, without any issues? I'm working on implementing support for Ruby's C extensions in an alternative implementation and it's a right slog.
  • mattip 8y ago
    PyPy dev here. Yes to both - all of them and it was a right slog. If it doesn’t work report an issue. We have a proposal looking for funding to make it fast.
    • Waterluvian 8y ago
      This is wonderful news to me. So broadly speaking I should be able to drop in replace cpython with pypy for my fairly not so special projects? I have a Django app that does some heavy data serialization and I'm not yet ready to optimize those serializers in another language. I can't wait to try this out. Crumb. I didn't realise pypy is on 3.5.3. Loves me my f strings.
      • orangecat 8y ago
        f-strings were "backported" to pypy and work fine.
      • mattip 8y ago
        We backported fstrings to 3.5. We also have an alpha quality linux 3.6 available on nightly builds
        • Waterluvian 8y ago
          Great! I appreciate you sharing this. I checked the PyPy main page, Downloads page, and Compatibility page and while I didn't look exhaustively, nothing mentioned 3.6 or 3.6 features.
  • tinix 8y ago
    No, numpy and pandas break with every new release, support for them is constantly lagging behind. Other C libraries too...
    • mattip 8y ago
      PyPy should be releasing soon, if you use cutting edge then you have to use cutting edge PyPy as well