The only difference between a file opened in w mode and one opened in w+ mode is where the data is physically placed in the file.

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Quizplus · Accepted Answer

Opening a file in 'w' mode is for writing only, and it will overwrite the existing file content or create a new file if it doesn't exist. Opening a file in 'w+' mode allows for both reading and writing, and it also overwrites the existing file or creates a new one if it doesn't exist. The difference is not about where data is placed but about the additional reading capability in 'w+' mode.

The Only Difference Between a File Opened in W Mode