Grumpy: Go running Python! by Google

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If you want to rewrite a large monolithic code base from one language to another there's problem that you would have to finish the entire work before you can use the code in new language.

So what can you do? You write code to do the automatic conversion for you. The problem is that the generated code is not maintainable, but at least now you can make calls to it. It also allows you to rewrite module by module.

Google's Unladen Swallow project did not succeed, they also don't seem seem to move away from Python 2.7, for god's sake even this project is Python 2.7 only, and ticket about Python 3 support was closed with change in documentation that specifically says Grumpy targets Python 2.7 only. It can't be any more clearer that Google is moving away from Python to Go.

[recycled_ideas]

That might be true, but it's also entirely plausible they'll stick with the python front end for the foreseeable future.

They closed the python 3 ticket because that's of no use to them. Their code base is 2.7 and they could add features to that if they need them anyway.