David
The function my_fancy_formula() is just a placeholder representing the
function *you* are supposed to define. For your very simple formula, you
don't really need a function: you can just include it inline. It becomes
def new_archive_record(self, event):
event.record['heatindex'] = event.record['outTemp'] *
event.record['humidity'] + 5
(Note that I got it wrong with the little code snippet that I posted
earlier. Everywhere it had 'record' it should be 'event.record'. Sorry, but
I did warn that it was not tested!)
You are asking very basic programming questions that have little to do with
weewx. I'd suggest taking an online course to learn the basics before
tackling something like this.
-tk
On Tue, Jun 27, 2017 at 11:05 AM, David Watts <[email protected]> wrote:
>
>
> I thought I'd have a go at creating a new service now. I've got most of
> the code in place and I've got the service to run, but I'm struggling a bit
> with the formula.
>
> The actual formula's very long so I've made up a short, fake one for the
> purposes of this post which is 'outTemp * outHumidity + 5'.
>
> The code for the service is therefore as follows:
>
>
>
>
>
>
>
>
>
>
>
> *import weewxfrom weewx.engine import StdServiceclass
> MyHeatIndex(StdService): def __init__(self, engine, config_dict):
> # Pass the initialization information on to my superclass:
> super(MyHeatIndex, self).__init__(engine, config_dict)
> self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record) def
> new_archive_record(self, record): record['heatindex'] =
> my_fancy_formula(record['outTemp'] * record['outHumidity'] + 5)*
>
>
> When I tried running that (with the actual formula in place), it says that
> my_fancy_formula isn't defined. I've read up about this but I'm unsure how
> to fix this - any help would be appreciated.
>
> Thanks
>
>
>
> On Thursday, 15 June 2017 19:44:40 UTC+1, Tom Keffer wrote:
>>
>> The "weewx way" would be to write a simple service that binds to the
>> NEW_ARCHIVE_RECORD events and replaces the value of heatindex with the
>> results of your calculation. Something like (NOT TESTED):
>>
>> from weewx.engine import StdService
>> class MyHeatIndex(StdService):
>>
>> def __init__(self, engine, config_dict):
>> # Pass the initialization information on to my superclass:
>> super(MyHeatIndex, self).__init__(engine, config_dict)
>> self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record)
>>
>> def new_archive_record(self, record):
>> record['heatindex'] = my_fancy_formula(record['windGust'],
>> record['outTemp'], ........)
>>
>> Run the service *after* StdWXCalculate.
>>
>> See the section *Creating a new service
>> <http://weewx.com/docs/customizing.htm#Adding_a_service>* for details.
>>
>> -tk
>>
>>
>> On Thu, Jun 15, 2017 at 9:52 AM, David Watts <[email protected]> wrote:
>>
>>> Hi
>>>
>>> I want to tinker with the 'heat index' formula in wxformulas.py and
>>> introduce wind gusts and speed into it.
>>>
>>> I notice the wind speed is available (V_mph, used for wind chill) but
>>> how would I introduce the wind gust?
>>>
>>> Thanks
>>>
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>>
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