心心念念的Python3.7终于 release了。 :?:
官网对新特性和优化的汇总:
**新语法特性:**
* PEP 563, postponed evaluation of type annotations.
**向后不兼容的语法更改:**
* `async` 和 `await` 现在是保留关键字
**新的库模块:**
* `contextvars`: PEP 567 - Context Variables
* `dataclasses`: PEP 557 - Data Classes
* importlib.resources
**新的 built-in 特性:**
* PEP 553, 新函数 `breakpoint()`
**Python 数据模型改进:**
* PEP 562, customization of access to module attributes.(访问模块属性,可以定制了)
* 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.
**标准库中的重要改进:**
* The `asyncio` module has received new features, significant usability and performance improvements. (asyncio 模块已经获得了新功能,显着的可用性和性能改进。)
* The `time` module gained support for functions with nanosecond resolution. (time 模块获得了对纳秒级分辨率功能的支持)
**CPython 实现的改进:**
* Avoiding the use of ASCII as a default text encoding: 取消 ASCII 作为默认文本编码
* 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 改进:**
* PEP 539, new C API for thread-local storage
**文档改进:**
* Python 官方文档的翻译,新增日文版、法语版和韩语版;
详见:[https://docs.python.org/3.7/whatsnew/3.7.html](https://docs.python.org/3.7/whatsnew/3.7.html)
Python 3.7 Release 了