返回任何声明为返回“str”的函数，同时返回 Dict val

Question

我有一个函数可以读取

version.py

并返回版本 val。该函数如下所示：

def write_ini() -> str:
    """Write version.ini file by extracting version from version.py."""
    # get root dirname
    filepath = realpath(__file__)
    root = dirname(dirname(dirname(filepath)))
    VERSION: Dict = {}

    # Extract version from version.py
    with open(op.join(root, "package_folder", "version.py"), encoding="utf8") as version_file:
        exec(version_file.read(), VERSION)
    print(VERSION["VERSION"])
    config["VERSION"] = {"cv_version": "v{}".format(VERSION["VERSION"])}

    # write to version.ini
    with open("version.ini", "w") as configfile:
        config.write(configfile)

    return VERSION["VERSION"]

version.py

脚本看起来像这样：

_MAJOR = "1"
_MINOR = "0"
_REVISION = "13"

VERSION_SHORT = f"{_MAJOR}.{_MINOR}"
VERSION = f"{_MAJOR}.{_MINOR}.{_REVISION}"

VERSION["VERSION"]

的类型是

str

。但是，我不断收到错误：

Returning Any from function declared to return "str"

我如何让它意识到该类型是

str

而不是

Any

？

Answer 1

您已将 VERSION 声明为通用字典，可以包含任何类型的值。如果您将注释更改为更具体，例如

VERSION: Dict[str, str] = {}

，mypy 会理解你返回的是一个字符串，因为你的字典被定义为只保存字符串值。