PyPy2.7 and PyPy3.5 v6.0 dual release

The PyPy team is proud to release both PyPy2.7 v6.0 (an interpreter supporting Python 2.7 syntax), and a PyPy3.5 v6.0 (an interpreter supporting Python 3.5 syntax). The two releases are both based on much the same codebase, thus the dual release.
This release is a feature release following our previous 5.10 incremental release in late December 2017. Our C-API compatibility layer cpyext is now much faster (see the blog post) as well as more complete. We have made many other improvements in speed and CPython compatibility. Since the changes affect the included python development header files, all c-extension modules must be recompiled for this version.
Until we can work with downstream providers to distribute builds with PyPy, we have made packages for some common packages available as wheels. You may compile yourself using pip install --no-build-isolation <package>, the no-build-isolation is currently needed for pip v10.
First-time python users are often stumped by silly typos and omissions when getting started writing code. We have improved our parser to emit more friendly syntax errors, making PyPy not only faster but more friendly.
The GC now has hooks to gain more insights into its performance
The default Matplotlib TkAgg backend now works with PyPy, as do pygame and pygobject.
We updated the cffi module included in PyPy to version 1.11.5, and the cppyy backend to 0.6.0. Please use these to wrap your C and C++ code, respectively, for a JIT friendly experience.
As always, this release is 100% compatible with the previous one and fixed several issues and bugs raised by the growing community of PyPy users. We strongly recommend updating.
The Windows PyPy3.5 release is still considered beta-quality. There are open issues with unicode handling especially around system calls and c-extensions.
The utf8 branch that changes internal representation of unicode to utf8 did not make it into the release, so there is still more goodness coming. We also began working on a Python3.6 implementation, help is welcome.
You can download the v6.0 releases here:

https://pypy.org/download.html

We would like to thank our donors for the continued support of the PyPy project. If PyPy is not quite good enough for your needs, we are available for direct consulting work.
We would also like to thank our contributors and encourage new people to join the project. PyPy has many layers and we need help with all of them: PyPy and RPython documentation improvements, tweaking popular modules to run on pypy, or general help with making RPython’s JIT even better.