How to change the mode of working with a file?

Question

Python

The task is as follows: you need to change the data from the file and write it to the same file.
The file is opened like this: How to change the mode of working with a file without repeating the open () instruction. Or, how to open a file for writing after saving the contents to a string variable? open('file.json', 'r')

Answer 1

And you can't open it for reading + writing with the 'r +' parameter?
save - do
data = myfile.read()
and then
newfile.write(data)

Answer 2

No way. You make an intermediate file, write there what you read from the desired file with changes, and then rename the new one to the old one