What’s New In Python 3.7 (JNNC Technologies)

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New syntax features:

• PEP 563, postponed evaluation of type annotations.

Backwards incompatible syntax changes:

• async and await are now reserved keywords.

New library modules:

• contextvars: PEP 567 – Context Variables
• dataclasses: PEP 557 – Data Classes
• importlib.resources

New built-in features:

• PEP 553, the new breakpoint() function.

Python data model improvements:

• PEP 562, customization of access to module attributes.
• PEP 560, core support for typing module and generic types.
• the insertion-order preservation nature of dict objects has been declared to be an official part of the Python language spec.

Significant improvements in the standard library:

• The asyncio module has received new features, significant usability and performance improvements.
• The time module gained support for functions with nanosecond resolution.

CPython implementation improvements:

• Avoiding the use of ASCII as a default text encoding:
  • PEP 538, legacy C locale coercion
  • PEP 540, forced UTF-8 runtime mode
• PEP 552, deterministic .pycs
• the new development runtime mode
• PEP 565, improved DeprecationWarning handling

C API improvements:

• PEP 539, new C API for thread-local storage

Documentation improvements:

• PEP 545, Python documentation translations
• New documentation translations: Japanese, French, and Korean.

This release features notable performance improvements in many areas. The Optimizations section lists them in detail.

For a list of changes that may affect compatibility with previous Python releases please refer to the Porting to Python 3.7 section.