Python file.write creating extra carriage return

\n is converted to os.linesep for files opened in text-mode. So when you write os.linesep to a text-mode file on Windows, you write \r\n, and the \n gets converted resulting in \r\r\n.

See also the docs:

Do not use os.linesep as a line terminator when writing files opened in text mode (the default); use a single ‘\n’ instead, on all platforms.

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