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。
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。
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。
The purpose of function annotations is to standardize the way a function's parameters or return values are annotated. The syntax for function annotations is
函数注释的作用是为了标准化函数参数或返回值被注释的方式。
If you specify annotations on the function declaration then you do not have to specify them on the function definition.
如果在函式宣告上指定附注，就不需要在函式定义上指定。
If you specify annotations on the function declaration then you do not have to specify them on the function definition.
如果在函式宣告上指定附注，就不需要在函式定义上指定。
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