Creating JSON in a class in Python

Question

I need to create a JSON class base called JCarOwner. It has to get attributes from its owner such as name, manufacture and year. I want to make it an unknown attribute:

def add_co (existing owner name, new_attribute , attribute content)

But I don't really know how. This is my code (corrected):

import json

class JCarOwner:

    CarOwner = []

    def __init__(self,name,manufacture=None,production_year=None):
        super(JCarOwner, self).__init__()
        self.CarOwner.append(json.dumps({"Owner_Name": name, "Car_Manufacture": manufacture, "Production_Year": production_year}))

    def COsave(filename):
        JCarOwner.CarOwner.dumps(filename,separators=(',', ':'))

    def COload(filename):
        JCarOwner.CarOwner.append(json.load(filename))

    def DispInfo(Car_Owner):

        for owner in JCarOwner.CarOwner:

            CO = json.load(owner)
            if CO[owner]["Owner_Name"]==Car_Owner:
                print(CO[owner])


jane = JCarOwner("Jane","Mazda",2016)
bob = JCarOwner("bob")     

JCarOwner.DispInfo(jane)

error:

AttributeError: 'str' object has no attribute 'read'

@Daniel Roseman something that the user want to add, if the json file had only name and car so the new will be price. — canat4702
– canat4702, Commented May 10, 2017 at 10:25
json is a text format (like say csv, xml, yaml etc), so the term "json class" doesn't make any sense. — bruno desthuilliers
– bruno desthuilliers, Commented May 10, 2017 at 10:32

hspandher · Accepted Answer · 2017-05-10 11:27:28Z

1

Use self.CarOwner instead of plain CarOwner.

 def __init__(self,name,manufacture,production_year):
   super(JCarOwner, self).__init__()

   self.CarOwner.append(json.dumps({"Owner_Name": name, "Car_Manufacture": manufacture, "Production_Year": production_year}))

Please try to follow certain python conventions.

edited May 10, 2017 at 11:27

answered May 10, 2017 at 11:11

hspandher

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15 Comments

canat4702 Over a year ago

I get this error: TypeError: object.__init__() takes no parameters

hspandher Over a year ago

Sorry my bad. fixed it.

canat4702 Over a year ago

I get this error: AttributeError: 'dict' object has no attribute 'read'

hspandher Over a year ago

which json library are you using? I'm assuming you are just importing default python json library. Try using 'json.loads' instead of 'json.load'.

canat4702 Over a year ago

I am using default Jason and tried loads and got: TypeError: the JSON object must be str, bytes or bytearray, not 'dict'.

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