python 类型注释

from typing import List, Tuple, Dict

names: List[str] = ['lily', 'tom']
version: Tuple[int, int, int] = (6, 6, 6)
operations: Dict[str, bool] = {'sad': False, 'happy': True}

安装 mypy 库运行脚本，会强制按类型检测，不符合类型注解要求的会报错：

# 安装
pip install mypy -U
# 运行脚本
mypy program.py