Release date: June 11, 2018

This is the release candidate of Python 3.7.0

This release, 3.7.0rc1, is the final planned release preview. Assuming no critical problems are found prior to 2018-06-27, the scheduled release date for 3.7.0, no code changes are planned between this release candidate and the final release.

Among the major new features in Python 3.7 are:

• PEP 538, Coercing the legacy C locale to a UTF-8 based locale
• PEP 539, A New C-API for Thread-Local Storage in CPython
• PEP 540, UTF-8 mode
• PEP 552, Deterministic pyc
• PEP 553, Built-in breakpoint()
• PEP 557, Data Classes
• PEP 560, Core support for typing module and generic types
• PEP 562, Module __getattr__ and __dir__
• PEP 563, Postponed Evaluation of Annotations
• PEP 564, Time functions with nanosecond resolution
• PEP 565, Show DeprecationWarning in __main__
• PEP 567, Context Variables

Please see What’s New In Python 3.7 for more information.

This release candidate is intended to give the wider community the opportunity to test the new features and bug fixes in 3.7.0 and to prepare their projects to support it. We strongly encourage maintainers of third-party Python projects to test with the 3.7.0 release candidate and report issues found to the Python bug tracker as soon as possible. Please keep in mind that this release candidate is still a preview release and, as such, its use is not recommended for production environments.

Full Changelog