To open a file for writing in Python, 'w' is used to indicate that any existing file of the same name should be written over, and 'a' is used to indicate that the output should be appended to an existing file.

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The 'w' mode in Python opens a file for writing and overwrites any existing content, while the 'a' mode opens a file for appending, adding new data to the end of the file without removing existing content.

To Open a File for Writing in Python, 'W' Is