How can I force Python’s file.write() to use the same newline format in Windows as in Linux (“\r\n” vs. “\n”)? [duplicate]

You need to open the file in binary mode i.e. wb instead of w. If you don’t, the end of line characters are auto-converted to OS specific ones.

Here is an excerpt from Python reference about open().

The default is to use text mode, which may convert ‘\n’ characters to a platform-specific representation on writing and back on reading.