python函数注释

def compile(source: 'something compilable',
            filename: 'where the compilable thing comes from',
            mode: 'is this a single statement or a suite?') -> bool:
    return True

print(compile.__annotations__)

{'source': 'something compilable', 'filename': 'where the compilable thing comes from', 'mode': 'is this a single statement or a suite?', 'return': <class 'bool'>}