Python 3.5+ type annotations

# Python 3.5+ supports 'type annotations' that can be
# used with tools like Mypy to write statically typed Python:

def my_add(a: int, b: int) -> int:
    return a + b

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参考文档:

typing - Support for type hints 类型标注支持
PEP 3107 -- Function Annotations
7.3 给函数参数增加元信息
8.6 Function definitions

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