假设我有一个过滤数据的函数,如下所示:
from typing import Dict, Union
def filterData(data: Dict[str, str], fields: Union[list, tuple]) -> dict:
filteredData = {}
for field in fields:
if field in data:
filteredData[field] = data[field]
return filteredData
我这样使用这个函数:
data = filterData({"a": "b", "c": "d"}, ("a")) # This should return {"a": "b"}.
现在,当我试图接近
a
性质类似
data.a
,我得到一个错误,上面写着
Instance of dict has no member a
. 如何定义和应用定义该词典所有成员的类型?
我试着创建一个类,
class ReqData():
a: str
然后像这样应用到变量上,
data: ReqData = filterData({"a": "b", "c": "d"}, ("a")
