Along with Python 3.15.0rc2, the second beta of the next Python install manager release is also available.
The changes in beta 1 are more interesting (though I forgot to post about them), but the two main changes are that ARM64 machines will now default to the ARM64 platform (that is, py -3.15 is equivalent to py -3.15-arm64 on an Arm device), and support has been added for HTTP_PROXY, HTTPS_PROXY and NO_PROXY environment variables.
Previously, the OS-wide proxy settings and authentication were respected, giving transparently good behaviour for most users, consistent with other native apps. These variables allow manual override of the global settings for special cases.
The change to the default platform is synchronised with our Windows Arm64 builds leaving “Experimental” status, as discussed/announced previously. To avoid this, update your configuration to set default_platform (%PYTHON_MANAGER_DEFAULT_PLATFORM%) to -64.
Please report any issues or feedback to Issues · python/pymanager · GitHub