[{"id":"1","name":"Paul","age":"21"},
  {"id":"2","name":"Peter","age":"22"},
  {"id":"3","name":"Paul","age":"23"}]

[{"id":"1"."name":"Paul","age":"21"},
  {"id":"2","name":"Peter","age":"22"}]

import json
ds = json.loads('python.json') #this file contains the json
unique_stuff = { each['name'] : each for each in ds }.values()

all_ids = [ each['name'] for each in ds ]
unique_stuff = [ ds[ all_ids.index(text) ] for text in set(texts) ]

print unique_stuff

import json

with open('python.json') as fp:
    ds = json.load(fp) #this file contains the json

    mem = {}

    for record in ds:
        name = record["name"]
        if name not in mem:
            mem[name] = record

    print mem.values()

new = []
seen = set()
for record in old:
    name = record['name']
    if name not in seen:
        seen.add(name)
        new.append(record)
del seen

ds = [{"id":"1","name":"Paul","age":"21"},
  {"id":"2","name":"Peter","age":"22"},
  {"id":"3","name":"Paul","age":"23"}]

{elem["name"]:elem for elem in ds}.values()
Out[2]:
[{'age': '23', 'id': '3', 'name': 'Paul'},
 {'age': '22', 'id': '2', 'name': 'Peter'}]