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)