TypeError: Params.my_params被认为是<class‘project’>，但是值{'host'：'txt'，‘Params.my_params’‘txt’‘，’roi_Params.my_params_id‘：123}是个白痴

Question

目标:从.yaml读取参数，以便在运行时传递给函数。

我在网上没有看到这个错误，所以决定发个帖子。

我有一个用户定义的params.yaml

my_params:
  host: txt
  project: txt
  roi_term_id: 123

# ...

这是由params.py读取的。

import os
from dataclasses import dataclass
from pathlib import Path
import yaml
from decouple import config
from typed_json_dataclass import TypedJsonMixin


@dataclass
class MyParams(TypedJsonMixin):
    host: str
    project: str
    roi_term: str

    def __post_init__(self):
        self.public_key = config('KEY')
        assert isinstance(self.public_key, str)
        self.private_key = config('SECRET')
        assert isinstance(self.private_key, str)
        super().__post_init__()

# ...
@dataclass
class Params(TypedJsonMixin):
    my_params: MyParams
    # ...


def load_params_dict():
    parameter_file = 'params.yaml'
    cwd = Path(os.getcwd())
    params_path = cwd / parameter_file
    if params_path.exists():
        params = yaml.safe_load(open(params_path))
    else:  # If this script is being called from the path directory
        params_path = cwd.parent / parameter_file
        params = yaml.safe_load(open(params_path))
    return params


params_dict = load_params_dict()
print(params_dict)
project_params = Params.from_dict(params_dict)

回溯：

  File "/home/me/miniconda3/envs/myvenv/lib/python3.7/site-packages/typed_json_dataclass/typed_json_dataclass.py", line 152, in __post_init__
    expected_type(**field_value)
TypeError: __init__() got an unexpected keyword argument 'roi_term_id'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "path/main.py", line 7, in <module>
    from params import project_params
  File "/home/me/PycharmProjects/project/path/params.py", line 89, in <module>
    project_params = Params.from_dict(params_dict)
  File "/home/me/miniconda3/envs/myvenv/lib/python3.7/site-packages/typed_json_dataclass/typed_json_dataclass.py", line 248, in from_dict
    return cls(**raw_dict)
  File "<string>", line 9, in __init__
  File "/home/me/miniconda3/envs/myvenv/lib/python3.7/site-packages/typed_json_dataclass/typed_json_dataclass.py", line 155, in __post_init__
    raise TypeError(f'{class_name}.{field_name} '
TypeError: Params.my_params is expected to be <class 'params.MyParams'>, but value {'host': 'txt', 'project': 'txt', 'roi_term_id': 123} is a dict with unexpected keys

Answer 1

2名称和dtype。

主题：

roi_term: str

名称：键在params.yaml中的名称必须与类中的属性的名称完全相同(我假定顺序)。

类中的属性表示str，但是当解析params.yaml文件时，它被认为是int --因为文件中的值是一个整数。在str类中，我将int改为了MyParams。

因此，来自params.yaml的params.yaml与来自MyParams类的roi_term冲突。