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python-uncompyle6 v3.6.3 Release Notes

Release Date: 2020-01-26 // about 4 years ago

  • 🚀 Of late, every release fixes major gaps and embarrassments of the last release....

    And in some cases, like this one, exposes lacuna and rot.

    I now have [control] flow under control, even if it isn't the most optimal way.

    ✅ I now have greatly expanded automated testing.

    👷 On the most recent Python versions I regularly decompile thousands of Python programs that are distributed with Python. when it is possible, I then decompile Python's standard test suite distributed with Python and run the decompiled source code which basically checks itself. This amounts to about 250 test programs per version. This is in addition to the 3 CI testing services which do different things.

    Does this mean the decompiler works perfectly? No. There are still a dozen or so failing programs, although the actual number of bugs is probably smaller though.

    🚀 However, in perparation of a more major refactoring of the parser grammar, this release was born.

    🔨 In many cases, decompilation is better. But there are some cases where decompilation has gotten worse. For lack of time (and interest) 3.0 bytecode suffered a hit. Possibly some code in the 3.x range did too. In time and with cleaner refactored code, this will come back.

    Commit c90ff51 was a local maxiumum before, I started reworking the grammar to separate productions that were specific to loops versus those that are not in loops.
    🚚 In the middle of that I added another grammar simplication to remove singleton productions of the form sstmts-> stmts. These were always was a bit ugly, and complicated output.

    At any rate if decompilation fails, you can try c90ff51. Or another decompiler. unpyc37 is pretty good for 3.7. wibiti uncompyle2 is great for 2.7. pycdc is mediocre for Python before 3.5 or so, and not that good for the most recent Python. Generally these programs will give some sort of answer even if it isn't correct.

    🛠 decompyle3 isn't that good for 3.7 and worse for 3.8, but right now it does things no other Python decompiler like unpyc37 or pycdc does. For example, decompyle3 handles variable annotations. As always, the issue trackers for the various programs will give you a sense for what needs to be done. For now, I've given up on reporting issues in the other decompilers because there are already enough issues reported, and they are just not getting fixed anyway.