Modes

r: Open text file for reading.  The stream is positioned at the beginning of the file.

r+: Open for reading and writing.  The stream is positioned at the beginning of the file.

w: Truncate file to zero length or create text file for writing. The stream is positioned at the beginning of the file.

w+: Open for reading and writing.  The file is created if it does not exist, otherwise, it is truncated.  The stream is positioned at the beginning of the file.

a: Open for writing.  The file is created if it does not exist.  The stream is positioned at the end of the file.  Subsequent writes to the file will always end up at the then current end of the file.

a+ : Open for reading and writing.  The file is created if it does not exist.  The stream is positioned at the end of the file.  Subsequent writes to the file will always end up at the then current end of the file.

 

Credit: https://stackoverflow.com/questions/1466000/python-open-built-in-function-difference-between-modes-a-a-w-w-and-r

 


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