Parse JSON array file python error

I am trying to parse a JSON file which is of the following format

[  
   {  
      "name":"name1",
      "age":"age1"
   },
   {  
      "name":"name2",
      "age":"age2"
   },
   {  
      "name":"name3",
      "age":"age3"
   }
]

When I use the JSON parser in python I am getting the following error:

> ValueError: No JSON object could be decoded

Here is my code :

import json

with open('sample.json') as data_file:    
    data = json.load(data_file)

print(data)