如何在 json 文件 python 中读取和写入特定行

Question

the json file looks like this:

{
    "Me": {
        "Age": 0,
        "Location": 0,
        "Friends": 0,
        "Family": 0
    },
    "You": {
        "Age": 0,
        "Location": 0,
        "Friends": 0,
        "Family": 0
    }
}

To read ["Me"]["Age"] and assign it to a variable I can use:

f = open('info.json')
data = json.load(f)
ageinfo = data["Me"]["Age"]

now, if the variable ageinfo updates, I want to send it back to the json file and save it. Im not exactly sure how to achieve this, maybe using json.dump? If anyone could help that would be greatly appreciated.

Answer 1

yes you can use the json.dump function to do that. Imagine you change the content of your dict

ageinfo = "new_value"

data["Me"]["Age"] = ageinfo

If you want to write it in a file info.json for instance the code would look like this:

with open('info.json', 'w') as outfile:
   json.dump(data, outfile)

This will update the file info.json with the content of your dict (or create it if it does not exist)