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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