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pypyproject.bsky.social
The developers of the PyPy project: a fast, compliant, open source Python interpreter. https://pypy.org/ https://github.com/pypy/pypy
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We just merged an improvement to the PyPy JIT heap optimizations: type based alias analysis for Python instances. Work was done by @cfbolz.bsky.social and their student Nico Rittinghaus.

submitted 17 days ago • 1 comment

nedbatchelder.com/blog/202503/... After nearly two years, I think this is finally ready: coverage․py can use sys.monitoring to more efficiently measure branch coverage.

submitted 89 days ago • 1 comment

Fast on the heels of the last release, I have published a PyPy v7.3.19 bug-fix release with PyPy2.7, PyPY3.10 and a beta-quality PyPy3.11. Please try it out! The complete release note is at doc.pypy.org/en/latest/re...

submitted 101 days ago • 0 comments

New blog post by my excellent master student Christoph Jung: "Low Overhead Allocation Sampling with VMProf in PyPy's GC" pypy.org/posts/2025/0... Hopefully the first in a series about his work on a sampling allocation profiler for PyPy

submitted 102 days ago • 0 comments

Since I was now wondering, here's PyPy VS CPython 3.x binary sizes

submitted 113 days ago • 0 comments

We don't do this regularly or anything, but every couple of years @cfbolz.bsky.social looks at how the PyPy binary sizes have developed. Looks like an ok balance between occasionally cleaning something up and thereby shrinking the binary; and then slow growth or explicit time/binary-size-tradeoffs.

submitted 113 days ago • 1 comment

As a response to these benchmarks, @cfbolz.bsky.social optimized `itertools.islice` for the common case where no step is given, and also for converting large but not very large integers to strings (basically any int that doesn't fit into 64 bits, but is also not really huge, maybe a few words).

submitted 118 days ago • 0 comments

Tim Peters benchmarking Python 3.13 vs PyPy on an OEIS sequence program he wrote: discuss.python.org/t/python-3-1... (the results are complicated, on one version Python 3.13 wins, but on others PyPy does).

submitted 118 days ago • 0 comments

Here's the blog post about the PyPY 7.3.18 release that came out yesterday. Thanks to @matti-p.bsky.social, our release manager! This the first version with 3.11 support (beta only so far). Two cool other features in the thread below. pypy.org/posts/2025/0...

submitted 120 days ago • 1 comment

PyPy 7.3.18, with Python3.11, 3.10, 2.7 is released. See the release note at doc.pypy.org/en/latest/re...

submitted 121 days ago • 0 comments

Hello, World!

submitted 121 days ago • 1 comment