import simplejson as json
python_obj={
 "a":  1,
 "a":  2,
 "a":  3, 
 "a": 4,   
 "b": 1, 
 "b": 2
 }

# print("original python object:")
# print(python_obj)
json_obj=json.dumps(python_obj)
# print("\nunique key in a json object:")
print(json_obj)

