How to read data from json file and write it to the same file?

Question

Python

Greetings.
There is a json file. It is necessary to read the data in it, add new ones and write to the same file. I can do all this separately, but I can't do it within one structure with open(file). Please share your solution.

Answer 1

First read, add the necessary data to the object and write. The code will "stretch" into two lines, but it will be clear what is happening.

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with open('file.txt', 'r+') as f:
    data = json.load(f)
    data.append(4)
    f.seek(0)
    json.dump(data, f)

The crutch is shorter than the beautiful and correct code by a whole 1 line