ECG类对象转JSON时报mappingproxy类型无法JSON序列化问题求助

1. 你没有实例化ECG类，而是直接把类本身赋值给了ecg变量：ecg = ecgModel.ECG 取到的是类对象，不是类的实例对象，类的__dict__属性是只读的mappingproxy类型，默认不支持JSON序列化。
2. ECG类的__init__方法被错误添加了@classmethod装饰器，构造方法是实例方法，不需要加类装饰器，加了之后就算你尝试实例化类也会报错。
3. 你定义的value属性的setter语法错误，setter只能接收1个额外的赋值参数，你定义了多个参数，后续调用会报错。

1. 修复ECGModel.py代码 #

class ECG(object):
    # 移除错误的@classmethod装饰器，给ecg参数加默认值兼容不传的场景
    def __init__(self, source, fileName, channel, record, time, sampleRate, ecg=None):
        self.Source = source
        self.FileName = fileName
        self.Channel = channel
        self.Record = record
        self.Time = time
        self.SampleRate = sampleRate
        self.ECG = ecg

    @property
    def value(self):
        print('Getting value')
        return self.Source, self.FileName, self.Channel, self.Record, self.Time, self.SampleRate, self.ECG

    # 不需要setter可以直接注释/删除，要用的话调整为接收单参数后解包
    # @value.setter
    # def value(self, args):
    #     source, fileName, channel, record, time, sampleRate, ecg = args
    #     self.Source = source
    #     self.FileName = fileName
    #     self.Channel = channel
    #     self.Record = record
    #     self.Time = time
    #     self.SampleRate = sampleRate
    #     self.ECG = ecg

    @value.deleter
    def value(self):
        print('Deleting value')
        del self.Source, self.FileName, self.Channel, self.Record, self.Time, self.SampleRate, self.ECG

2. 修复Processor.py的实例化逻辑 #

import streamlit as st
import Controllers.ECGModel as ecgModel

def GetSourceProperty(filePath):
    # 实例化ECG类，不要直接赋值类本身
    ecg = ecgModel.ECG(
        source = "MIT",
        fileName = "100",
        channel = 2,
        record = 11520000,
        time = 1800,
        sampleRate = 500
    )
    return ecg

3. 调整Main.py的序列化逻辑 #

手动构造目标字典，刚好匹配你需要的输出格式，避免带入不需要的ECG字段：

import streamlit as st
import Processor as processor
import json

ecgProperty = processor.GetSourceProperty(r"C:\Users\100.dat")

st.write(type(ecgProperty))
st.write(ecgProperty)
# 手动构造需要序列化的字段，格式完全匹配预期
serialized_dict = {
    "Source": ecgProperty.Source,
    "FileName": ecgProperty.FileName,
    "Channel": ecgProperty.Channel,
    "Record": ecgProperty.Record,
    "Time": ecgProperty.Time,
    "SampleRate": ecgProperty.SampleRate
}
jsonECGPropertyStr = json.dumps(serialized_dict)
st.write(jsonECGPropertyStr)

内容的提问来源于stack exchange，提问作者Huy DQ