Read json file and get output values using python : i want to fetch the output of below json file using python 

Json file 

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

    {
        "Name": [
            {
                "name": "John",
                "Avg": "55.7"
            },
            {
                "name": "Rose",
                "Avg": "71.23"
            },
            {
                "name": "Lola",
                "Avg": "78.93"
            },
            {
                "name": "Harry",
                "Avg": "95.5"
            }
         
        ]
    }

<!-- end snippet -->

I want to get the average marks of the person, when i look for harry
i.e i need output in below or similar format
Harry = 95.5