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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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Getting Started
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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 2 days ago • 0 comments

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

submitted 13 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 14 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 18 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 18 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 20 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 21 days ago • 0 comments

Hello, World!

submitted 21 days ago • 2 comments