STINNER Victor <victor.stin...@haypocalc.com> added the comment: print() uses PyFile_WriteString("\n", file) by default (if the end argument is not set) to write the newline. TextIOWrapper.write("\n") replaces "\n" by TextIOWrapper._writenl.
On Windows, stdin, stdout and stderr are creates using TextIOWrapper(..., newline=None). In this case, TextIOWrapper._writenl is os.linesep and so '\r\n'. To sum up, print() writes '\n' into sys.stdout, but sys.stdout write b'\r\n' into the file descriptor 1 which is a binary file (ie. the underlying OS file doesn't translate newlines). If the output is redirected (e.g. into a file), TextIOWrapper is created with line_buffering=False. You may try to force line_buffering=True when the output is redirected. ---------- nosy: +pitrou _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue13119> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com