Trouble writing lines into file with line feeds- Python Newb

[Jussi Piitulainen]

daniel.t.healy at gmail.com writes:
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> Problem: The file only contains P2. It always overwrites the first
> line. I can send 20 strings and the file will always contain the
> last string received.
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> while True:
>         rawcode=ser.readline()
>         codelog=open('/home/pi/avdms/codes.log','w')
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That's what file mode 'w' does. Use 'a'.

Also consider the logging module.

See <http://docs.python.org/3/library/functions.html#open> for open.

See <http://docs.python.org/3/library/logging.html> for logging.