pyserial

[Petr Jakes]

I can recommend you to read pyserial documentation and look to the
examples. Browsing through this discussion group can help you a lot as
well.
Generally if the timeout is set to 0 (zero) the code will wait and wait
and wait till the data will arrive to the serial port (if there is not
data on the serial port, you can wait "forever" and you can think your
code is "frozen" :) )
Because of that, you can set the timeout, so after some time of waiting
for the data (when the data do not arrive) the code continues on the
next line.

Try to experiment a little bit with some simple and short code first,
so you will be able to understand how to communicate with the serial
port.
HTH
Petr Jakes