The full-form of JSON is JavaScript Object Notation. It means that a script (executable) file which is made of text in a programming language, is used to store and transfer the data. Python supports JSON through a built-in package called json. To use this feature, we import the json package in Python script. The text in JSON is done through quoted string which contains the value in key-value mapping within { }.
Functions Used:
- json.loads(): json.loads() function is present in python built-in ‘json’ module. This function is used to parse the JSON string.
Syntax: json.loads(json_string)
Parameter: It takes JSON string as the parameter.
Return type: It returns the python dictionary object.
- json.dumps(): json.dumps() function is present in python built-in ‘json’ module. This function is used to convert Python object into JSON string.
Syntax: json.dumps(object)
Parameter: It takes Python Object as the parameter.
Return type: It returns the JSON string.
- update(): This method update the dictionary with elements from another dictionary object or from an iterable key/value pair.
Syntax: dict.update([other])
Parameters: Takes another dicitonary or an iterable key/value pair.
Return type: Returns None.
Example 1: Updating a json string.
# Python program to update# JSON import json # JSON data:x = '{ "organization":"GeeksForGeeks", "city":"Noida", "country":"India"}' # python object to be appendedy = {"pin":110096} # parsing JSON string:z = json.loads(x) # appending the dataz.update(y) # the result is a JSON string:print(json.dumps(z)) |
Output:
{“pin”: 110096, “organization”: “GeeksForGeeks”, “country”: “India”, “city”: “Noida”}
Example 2: Updating a JSON file. Suppose the json file looks like this.
We want to add another json data after emp_details. Below is the implementation.
# Python program to update# JSON import json # function to add to JSONdef write_json(data, filename='data.json'): with open(filename,'w') as f: json.dump(data, f, indent=4) with open('data.json') as json_file: data = json.load(json_file) temp = data['emp_details'] # python object to be appended y = {"emp_name":'Nikhil', "email": "nikhil@geeksforgeeks.org", "job_profile": "Full Time" } # appending data to emp_details temp.append(y) write_json(data) |
Output:
