Conversion of the class object to JSON is done using json package in Python. json.dumps() converts Python object into a json string. Every Python object has an attribute which is denoted by __dict__ and this stores the object’s attributes.
- Object is first converted into dictionary format using __dict__ attribute.
- This newly created dictionary is passed as a parameter to json.dumps() which then yields a JSON string.
Syntax: json.dumps(Object obj)
Parameter: Expects a dictionary object.
Return: json string
Following python code converts a python class Student object to JSON.
Python3
# import required packagesimport json # custom classclass Student: def __init__(self, roll_no, name, batch): self.roll_no = roll_no self.name = name self.batch = batch class Car: def __init__(self, brand, name, batch): self.brand = brand self.name = name self.batch = batch # main functionif __name__ == "__main__": # create two new student objects s1 = Student("85", "Swapnil", "IMT") s2 = Student("124", "Akash", "IMT") # create two new car objects c1 = Car("Honda", "city", "2005") c2 = Car("Honda", "Amaze", "2011") # convert to JSON format jsonstr1 = json.dumps(s1.__dict__) jsonstr2 = json.dumps(s2.__dict__) jsonstr3 = json.dumps(c1.__dict__) jsonstr4 = json.dumps(c2.__dict__) # print created JSON objects print(jsonstr1) print(jsonstr2) print(jsonstr3) print(jsonstr4) |
Output:
{"roll_no": "85", "name": "Swapnil", "batch": "IMT"}
{"roll_no": "124", "name": "Akash", "batch": "IMT"}
{"brand": "Honda", "name": "city", "batch": "2005"}
{"brand": "Honda", "name": "Amaze", "batch": "2011"}
