如何使用类型提示为参数指定多种类型? [英] How do I specify multiple types for a parameter using type-hints?

问题描述

我有一个Python函数，该函数接受XML数据作为 str .

I have a Python function which accepts XML data as an str.

为方便起见，该函数还会检查 xml.etree.ElementTree.Element ，并在必要时自动将其转换为 str .

For convenience, the function also checks for xml.etree.ElementTree.Element and will automatically convert to str if necessary.

import xml.etree.ElementTree as ET

def post_xml(data: str):
    if type(data) is ET.Element:
        data = ET.tostring(data).decode()
    # ...

是否可以通过类型提示指定可以将参数指定为两种类型之一?

Is it possible to specify with type-hints that a parameter can be given as one of two types?

def post_xml(data: str or ET.Element):
    # ...

推荐答案

您需要输入联盟:

from typing import Union

def post_xml(data: Union[str, ET.Element]):
    ...

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