Hi
I'm migrating from wview and very excited with what can be done with weewx.
At the moment I have php code and custom C code and I can see I can create
a much better package with weewx.
I'm trying to get my head around how a can construct a search list
extension so I can find the change in a value from a week , month or year
ago
For example in a template I have this
$week.outHumidity.avg.raw - $week($weeks_ago=1).outHumidity.avg.raw
I want to know compared to last week / month / year whats the difference in
the average temp , total rain etc
I'm looking at the example below and thinking ok. So I need to run the
stats for two periods and subtract them.
week_dt = datetime.date.fromtimestamp(timespan.stop) - \
datetime.timedelta(weeks=1) # 5
# Convert it to unix epoch time:
week_ts = time.mktime(week_dt.timetuple()) # 6
# Form a TimespanBinder object, using the time span we just
# calculated:
seven_day_stats = TimespanBinder(TimeSpan(week_ts, timespan.stop),
db_lookup,
formatter=self.generator.formatter,
converter=self.generator.converter,
skin_dict=self.generator.skin_dict)
Would it work if I did something like
seven_day_stats1 = TimespanBinder ....
seven_day_stats2 = TimespanBinder ....
seven_day_stats = seven_day_stats1 - seven_day_stats2
Thanks - I contributed a few features to wview. Hopefully I can do the same
with weewx.
Cheers
Michael
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