Release date: June 27, 2018

Note: The release you are looking at is Python 3.7.0, the initial feature release for the legacy 3.7 series which has now reached end-of-life and is no longer supported. See the downloads page for currently supported versions of Python. The final source-only security fix release for 3.7 was 3.7.17.

Among the major new features in Python 3.7 are:

• PEP 539, new C API for thread-local storage
• PEP 545, Python documentation translations
• New documentation translations: Japanese, French, and Korean.
• PEP 552, Deterministic pyc files
• PEP 553, Built-in breakpoint()
• PEP 557, Data Classes
• PEP 560, Core support for typing module and generic types
• PEP 562, Customization of access to module attributes
• PEP 563, Postponed evaluation of annotations
• PEP 564, Time functions with nanosecond resolution
• PEP 565, Improved DeprecationWarning handling
• PEP 567, Context Variables
• Avoiding the use of ASCII as a default text encoding (PEP 538, legacy C locale coercion and PEP 540, forced UTF-8 runtime mode)
• The insertion-order preservation nature of dict objects is now an official part of the Python language spec.
• Notable performance improvements in many areas.

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

Full Changelog