The full grammar for function annotations can be found in PEP 3107 (see Resources for a link).

函数注释的完整语法可以在PEP 3107(相关链接，请参见参考资料)内找到。

youdao

Function annotations associate expressions with parts of a function, such as parameters, at compile time.

函数注释会在编译时将表述与函数的某些部分(比如参数)相关联。

youdao

Left to themselves, function annotations are meaningless-that is, they aren't processed unless a third-party library does so.

就其本身而言，函数注释是无意义的—即，除非第三方库对之进行处理，否则它们不会被处理。

youdao