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python - Python，将 Json-Data 放入变量中

问题描述

我想将 Json-File 数据放入单个变量中。所以我可以将变量用于其他事情。我能够从其他 QDialog 的输入创建一个 Json 文件。下一步是从 Json 文件中取回输入并将其插入到各个变量中。所以 json:Line1 变成 self.line1Config 等等。

self.jsonfile = str(self.tn+'.json')

def WriteJSON(self):

    self.NewConfigJSON = {}
    self.NewConfigJSON['configs'] = []
    self.NewConfigJSON['configs'].append({
        'Line1':  str(self.CreatNewJsonW.Line1),
        'Line2':  str(self.CreatNewJsonW.Line2),
        'Line3':  str(self.CreatNewJsonW.Line3)
    })
    jsonString = json.dumps(self.NewConfigJSON)
    jsonFile = open(self.jsonfile, 'w')
    jsonFile.write(jsonString)
    jsonFile.close()

使用下面的代码，它不会工作：

  def CheckIfJsonFileIsAlreadyThere(self):
    try:
        if os.path.isfile(self.jsonfile) == True:
            data = json.loads(self.jsonfile)

            for daten in data:
                self.line1Config = daten['Line1']
                self.line2Config = daten['Line2']
                self.line3Config = daten['Line3']
        else:
            raise Exception
         
    except Exception:
        self.label_ShowUserText("There are no configuration yet. Please create some 
        configuartions")
        self.label_ShowUserText.setStyleSheet("color: black; font: 12pt \"Arial\";")

错误代码：

Traceback (most recent call last):
  File "c:\path", line 90, in CheckIfJsonFileIsAlreadyThere
    data = json.loads(self.jsonfile)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.1776.0_x64__qbz5n2kfra8p0\lib\json\__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.9_3.9.1776.0_x64__qbz5n2kfra8p0\lib\json\decoder.py", line 340, in decode
    raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 11 (char 10)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:\path", line 38, in <module>
    MainWindow = mainwindow()
  File "path", line 21, in __init__
    self.d = Generator_Dialog(self)
  File "c:\path", line 55, in __init__
    self.CheckIfJsonFileIsAlreadyThere()
  File "c:path", line 100, in CheckIfJsonFileIsAlreadyThere
    self.label_ShowUserText("There are no configuration yet. Please create some configuartions")
TypeError: 'QLabel' object is not callable

标签： pythonjson

解决方案

由于 JSON 文档来自专门来自 的文件self.jsonfile = str(self.tn+'.json')，因此请使用json.load()而不是json.loads()：

  • json.loads

    将s（包含 JSON 文档的 str、bytes 或 bytearray 实例）反序列化为 Python 对象

  • json.load

    将 fp（一个.read()支持文本文件或包含 JSON 文档的二进制文件）反序列化为 Python 对象

更改此行：

data = json.loads(self.jsonfile)

到

with open(self.jsonfile) as opened_file:
    data = json.load(opened_file)

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