计算JSON文件中的唯一值

Question

I have a JSON file with the following setup:

{
    "1": {
        "id":123456,
        "name":"John Doe",
        "address":"Address 1"
    }, 
    "2": {
        "id":789011,
        "name":"Name Nameson",
        "address":"Address 2"
    }
}

The thing with this file, is that it contains A LOT of duplicates. So what I want is to be able to count how many unique people there are just by their ID. Or really any value they have would work, as no one has the same name or address. So say there are 300 people in the list, and only 50 of them are unique, the rest are duplicates, I want to be able to display that.

I've looked it up on google, but I can't really find anything that works for me...

Answer 1

You can add all the ids to a set:

unique_ids = set(item['id'] for item in my_data.values())
print(len(unique_ids))