how to read serial stream of data [newbie]

Heiko Wundram modelnine at modelnine.org
Tue Feb 7 15:04:39 CET 2012


Am 07.02.2012 14:48, schrieb Antti J Ylikoski:
> On 7.2.2012 14:13, Jean Dupont wrote:
>> ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,
>> rtscts=0, dsrdtr=0, timeout=15)
>
> In Python, if you want to continue the source line into the next text
> line, you must end the line to be continued with a backslash '\'.

Absolutely not true, and this is bad advice (stylistically).

When (any form of) brackets are open at the end of a line, Python does 
not start a new command on the next line but rather continues the 
backeted content.

So:

ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,
                      rtscts=0, dsrdtr=0, timeout=15)

is perfectly fine and certainly the recommended way of putting this.

Adding the backslash-continuation is always _possible_, but only 
_required_ when there are no open brackets.

So:

x = "hello" \
     " test"

is equivalent to:

x = ("hello"
      " test")

in assigning:

x = "hello test"

-- 
--- Heiko.



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