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import json

def retrieve_json(name):
	with open(name) as dj:
		data = json.load(dj)
		return data
		
def add_data(name, key, value):
	try:
		book = retrieve_json(name)
		book[key] = value
		dj = open(name, 'w')
		dj.write(json.dumps(book))
		dj.close()
		return 'data saved'
	except:
		return 'data not saved'