Hi mick,
i am really sorry, but obviously your post scrolled out of my inbox
view ... and i just forgot it ;)
well, KeyError is the desired behaviour when you do a "get" on a
"dictionary" like object ... so your code should be prepared for it ;)
as i see aou alread catch the IOError - however i am very unsure why you
do this ... ?!?! pyowfs shouldnt raise an IOError at all ...
but instead you should watch ot for KeyError whenever accessing an
attribute from a Sensor ...
e.g.:
@property
def present (self) :
try:
return self.sensor.get ("present")
except IOError, KeyError:
return -777
or
@property
def present (self) :
try:
return self.sensor.get ("present")
except IOError:
return -777
except KeyError :
print "key not found"
return -888
or simply in your main loop :
s1 = Sens1 (connection)
s2 = Sens2 (connection)
while True : # repeat forever
for s in [s1,s2] :
try :
print "reading %r" % s
print 'temp = ', s.temp
print 'id = ', s.id
print 'present = ', s.present
print 'power = ', s.power
except KeyError :
print "something wrong with sensor %r" % s
hope this helps you out ;)
regards,
marcus.
Am Mittwoch, den 19.05.2010, 23:27 +0100 schrieb Mick Sulley:
> Hi Marcus,
>
> Thanks for your fast response. I just tested version 0.1.3, I now get
>
> Start of loop 21530
> S1 reading
> temp = 26.5
> id = 522FA9010800
> present = 1
> power = 0
> S2 reading
> temp = something wrong with temp
> None
> id = 2054A9010800
> present =
> Traceback (most recent call last):
> File "./pyowfs_test1.py", line 72, in <module>
> print 'present = ', s2.present
> File "./pyowfs_test1.py", line 36, in present
> return self.sensor.get ("present")
> File "/usr/local/lib/python2.6/dist-packages/pyowfs/owfs.py", line 95,
> in get
> raise KeyError (key)
> KeyError: 'present'
> m...@mick-desktop:~/Documents/Controls$
>
>
> What I am trying to do is to read the data from all the sensor and if
> one goes missing flag it up somehow, maybe setting the 'present'
> attribute to zero, but it needs to continue reading the others and if
> the missing one come back it needs to start reading that one as well.
>
> Here is the code that I am using to test, maybe there is a better way to
> achieve this?
>
>
> #! /usr/bin/env python
> # Filename pyowfs_test1.py
> # based up the code from Marcus Priesch
>
>
> from pyowfs import Connection
> import sys
>
> class Sensor (object) :
> id = None
> def __init__ (self, connection):
> self.conn = connection
> self.sensor = connection.find (id = self.id)[0]
> self.cache = 0
>
> """class TempSensor (Sensor) :
> def temp (self) :
> return float (self.sensor.get ("temperature"))
> """
> class TempSensor (Sensor) :
> @property
> def temp (self) :
> try:
> return float (self.sensor.get ("temperature"))
> except TypeError:
> print 'something wrong with temp'
> @property
> def power (self) :
> try:
> return self.sensor.get ("power")
> except IOError:
> return -888
> @property
> def present (self) :
> try:
> return self.sensor.get ("present")
> except IOError:
> return -777
> @property
> def id (self) :
> try:
> return self.sensor.get ("id")
> except IOError:
> return "Cant find the id"
>
> class Sens1 (TempSensor) :
> id = "522FA9010800"
>
> class Sens2 (TempSensor) :
> id = "2054A9010800"
>
> """ Start of the main program """
> connection = Connection("/dev/ttyD1")
> for s in connection.find () :
> print s
>
> loop = 0
> """ Need to read the sensor list and match the sensors found to the
> names on the list, mark each one as present or not """
>
> s1 = Sens1 (connection)
> s2 = Sens2 (connection)
> while loop > -1:
> print 'Start of loop ', loop
> print 'S1 reading '
> print 'temp = ', s1.temp
> print 'id = ', s1.id
> print 'present = ', s1.present
> print 'power = ', s1.power
> print 'S2 reading '
> print 'temp = ', s2.temp
> print 'id = ', s2.id
> print 'present = ', s2.present
> print 'power = ', s2.power
> loop = loop + 1
>
>
> ------------------------------------------------------------------------------
>
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