Different platforms have different codes for 'new line'. Windows have r n, Unix has n, Old macs have r and yes there are some systems that have n r too. When you open a file in text mode in Python 3, it will convert all newlines to ' n' and be done with it. Infile = open('filename', 'r') Text mode is default, so if you say nothing, it's text mode. But it's always better to be explicit: infile = open('filename', 'rt') If you don't want the translation of line endings to happen, open the file in binary mode: infile = open('filename', 'rb') In Python 2 it's different. There this conversion would only happen by default on Windows.

If you wanted it to happen on other platforms, you could add the universal newline flag: infile = open('filename', 'rU') However, you say that you are on Python 3, and there it happens in text mode on all platforms, so adding the U flag should make no difference.

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