1. The ordering of your services is still not quite right. The group
"data_services" is run before "process_services." You want
data_services = ,
process_services = weewx.engine.StdConvert, weewx.engine.StdCalibrate,
weewx.engine.StdQC,
weewx.wxservices.StdWXCalculate, user.electricity.AddElectricity
2. In the interest of realism, the simulator occasionally emits a None
value for a datum. This is what is causing your ET to be None. You need to
get in the habit of checking for None. Something like:
ET = event.record.get('ET')
if ET is not None:
event.record['neerslagtekort'] = ...
3. Incidentally, you really should change the names to something more
meaningful than "electricity.py" and "AddElectricity".
-tk
On Wed, May 27, 2020 at 1:20 PM Maarten van der Hoeven <[email protected]>
wrote:
> Hmmm, maybe adding ET to Simulator is not such a bad idea... Just adding
> the ET-observation to this code:
>
> self.observations = {
> 'outTemp' : Observation(magnitude=20.0, average= 50.0,
> period=24.0, phase_lag=14.0, start=start_ts),
> 'inTemp' : Observation(magnitude=5.0, average= 68.0,
> period=24.0, phase_lag=12.0, start=start_ts),
> 'barometer' : Observation(magnitude=1.0, average= 30.1,
> period=48.0, phase_lag= 0.0, start=start_ts),
> 'pressure' : Observation(magnitude=1.0, average= 30.1,
> period=48.0, phase_lag= 0.0, start=start_ts),
> 'windSpeed' : Observation(magnitude=5.0, average= 5.0,
> period=48.0, phase_lag=24.0, start=start_ts),
> 'windDir' : Observation(magnitude=180.0, average=180.0,
> period=48.0, phase_lag= 0.0, start=start_ts),
> 'windGust' : Observation(magnitude=6.0, average= 6.0,
> period=48.0, phase_lag=24.0, start=start_ts),
> 'windGustDir': Observation(magnitude=180.0, average=180.0,
> period=48.0, phase_lag= 0.0, start=start_ts),
> 'outHumidity': Observation(magnitude=30.0, average= 50.0,
> period=48.0, phase_lag= 0.0, start=start_ts),
> 'inHumidity' : Observation(magnitude=10.0, average= 20.0,
> period=24.0, phase_lag= 0.0, start=start_ts),
> 'radiation' : Solar(magnitude=1000, solar_start=6,
> solar_length=12),
> 'UV' : Solar(magnitude=14, solar_start=6,
> solar_length=12),
> 'rain' : Rain(rain_start=0, rain_length=3,
> total_rain=0.2, loop_interval=self.loop_interval),
> 'txBatteryStatus': BatteryStatus(),
> 'windBatteryStatus': BatteryStatus(),
> 'rainBatteryStatus': BatteryStatus(),
> 'outTempBatteryStatus': BatteryStatus(),
> 'inTempBatteryStatus': BatteryStatus(),
> 'consBatteryVoltage': BatteryVoltage(),
>
>
> Op dinsdag 26 mei 2020 23:38:26 UTC+2 schreef Maarten van der Hoeven:
>>
>> Hi group,
>>
>> Having programming experience, but new to python. Want to write some
>> piece of code, that calculates the amount of precipitation shortage (rain
>> minus evaotranspiration). It's a measure of drought.
>>
>> Using some example coding, and extended those.
>>
>>
>> See the piece of code below. event.record['barometer'] and
>> event.record['outTemp'] is working (used as an example, no drought-relation
>> ship); they give real values.
>>
>> However, event.record['ET'] gives me a KeyError. I dont understand it. It
>> is in my wview_extended schema (which I extended), its also populated in my
>> database.
>>
>> Why the KeyError?
>>
>>
>> import schemas.wview_extended
>> schema = {
>> 'table': schemas.wview_extended.table + [('neerslagtekort', 'REAL')],
>> 'day_summaries' : schemas.wview_extended.day_summaries +
>> [('neerslagtekort', 'SCALAR')]
>> }
>>
>> import weewx.units
>> weewx.units.obs_group_dict['neerslagtekort'] = 'group_rain'
>>
>>
>> neerslag = 0
>> verdamping = 0
>> neerslagtekort = 0
>>
>> class AddElectricity(StdService):
>>
>> def __init__(self, engine, config_dict):
>>
>> # Initialize my superclass first:
>> super(AddElectricity, self).__init__(engine, config_dict)
>>
>> # Bind to any new archive record events:
>> self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record)
>>
>> self.last_total = None
>>
>> def new_archive_record(self, event):
>>
>>
>> barometer = event.record['barometer']
>> outTemp = event.record['outTemp']
>> ET = event.record['ET']
>> shortage = precipitation - evaporation
>>
>> if self.last_total:
>> event.record['neerslagtekort'] = shortage
>>
>> self.last_total = shortage
>> print("**** NEERSLAGTEKORT **** ")
>> print(shortage)
>>
>>
>>
>> Traceback (most recent call last):
>> File "/usr/share/weewx/weewxd", line 261, in <module>
>> main()
>> File "/usr/share/weewx/weewxd", line 154, in main
>> engine.run()
>> File "/usr/share/weewx/weewx/engine.py", line 202, in run
>> self.dispatchEvent(weewx.Event(weewx.POST_LOOP))
>> File "/usr/share/weewx/weewx/engine.py", line 224, in dispatchEvent
>> callback(event)
>> File "/usr/share/weewx/weewx/engine.py", line 596, in post_loop
>> self._software_catchup()
>> File "/usr/share/weewx/weewx/engine.py", line 656, in _software_catchup
>> self.engine.dispatchEvent(weewx.Event(weewx.NEW_ARCHIVE_RECORD,
>> File "/usr/share/weewx/weewx/engine.py", line 224, in dispatchEvent
>> callback(event)
>> File "/usr/share/weewx/user/electricity.py", line 64, in
>> new_archive_record
>> ET = event.record['ET']
>> KeyError: 'ET'
>>
>>
>> mysql> select from_unixtime(datetime), neerslagtekort,ET,rain from
>> archive order by datetime desc limit 5;
>>
>> +-------------------------+---------------------+--------------------------+------+
>> | from_unixtime(datetime) | neerslagtekort | ET
>> | rain |
>>
>> +-------------------------+---------------------+--------------------------+------+
>> | 2020-05-26 23:26:00 | -1.5559202862588535 |
>> 0.000005153290200925555 | 0 |
>> | 2020-05-26 23:25:00 | NULL |
>> 0.000005156477243511403 | 0 |
>> | 2020-05-26 23:24:00 | 20 |
>> 0.000005159745765396156 | 0 |
>> | 2020-05-26 23:23:00 | 20 |
>> 0.0000051629007161015734 | 0 |
>> | 2020-05-26 23:22:00 | NULL |
>> 0.000005165840624070325 | 0 |
>>
>> +-------------------------+---------------------+--------------------------+------+
>> 5 rows in set (0.00 sec)
>>
>>
>> --
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