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A comment on So, you want to try PyPy.

Re:So, you want to try PyPy by swinglock on Thursday March 28, 2013 @09:16AM (#5454570)
Download and install PyPy. 2.0 beta 1 or upcoming 2.0 beta 2 would be a good candidate; it's not called a beta for stability reasons.

So what does beta mean to PyPy then?

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Re:So, you want to try PyPy by DasIch on Thursday March 28, 2013 @09:22AM (#5454595)
It means that not all features they want to include in 2.0 are in yet but there is enough to warrant a release of some kind.

PyPy is generally so stable that people are using nightlies in production, provided they pass all the tests.

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Re:So, you want to try PyPy by mikeash on Thursday March 28, 2013 @11:51AM (#5455525)
Actually, it's because it contains some performance regressions. To quote their release notes:

"This release is not a typical beta, in a sense the stability is the same or better than 1.9 and can be used in production. It does however include a few performance regressions documented below that don’t allow us to label is as 2.0 final. (It also contains many performance improvements.)"

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