Thanks again Tom,
Hopefully the last question for today!
I currently have (truncated for brevity)
from weewx.cheetahgenerator import SearchList
import weewx.tags
class GarageDoorAnalyzer(SearchList):
def __init__(self, generator):
SearchList.__init__(self, generator)
def get_extension_list(self, timespan, db_lookup):
stats = weewx.tags.TimeBinder(
db_lookup,
timespan.stop,
formatter=self.generator.formatter,
converter=self.generator.converter)
latest = stats.day.outTemp.latest
print latest
self.search_list_extension[tag_name] = self._DoSomethingWithLatest(
latest)
return[self.search_list_extension]
When I run this, i get the following traceback:
, line 67, in get_extension_list
latest = stats.day.outTemp.latest
AttributeError: 'function' object has no attribute 'outTemp'
On Sunday, June 25, 2017 at 11:37:55 AM UTC-6, Tom Keffer wrote:
>
> I cut-and-paste from the definition for function
> Stats.get_extension_list()
> <https://github.com/weewx/weewx/blob/v3.7.1/bin/weewx/cheetahgenerator.py#L537>.
>
> You can see where trend_dict came from there. However, unless you plan to
> use something like stats.trend in your search list extension (unlikely),
> it, and several other parameters, can be safely left out. A more minimal
> assignment for stats would look like:
>
> stats = weewx.tags.TimeBinder(
> db_lookup,
> timespan.stop,
> formatter=self.generator.formatter,
> converter=self.generator.converter)
>
> As for how often an SLE gets called, that depends on the usage pattern.
> Without seeing the exact pattern you are using it's hard to say, but
> something I see quite often is Cheetah expressions that look something like
> this (this came up today):
>
> #if $day.UV.has_data
> <tr>
> <td class="stats_label">UV</td>
> #if $current.UV.raw <= 2.4
> <td class="stats_data" style="background-color:
> limegreen">$current.UV</td>
> #else if $current.UV.raw >= 2.5 and $current.UV.raw <= 5.4
> <td class="stats_data" style="background-color: yellow">$current.UV</td>
> #else if $current.UV.raw >= 5.5 and $current.UV.raw <= 7.4
> <td class="stats_data" style="background-color: orange">$current.UV</td>
> #else if $current.UV.raw >= 7.5 and $current.UV.raw <= 10.4
> <td class="stats_data" style="background-color: red">$current.UV</td>
> #else if $current.UV.raw > 10.5
> <td class="stats_data" style="background-color: violet">$current.UV</td>
> #end if
> </tr>
> #end if
>
>
> This snippet will use the Current SLE up to eight times, just to get the
> UV value. If the UV value is not available in the current record, that
> means up to 8 SQL queries! A more efficient pattern is:
>
> #if $day.UV.has_data
> #set $current_UV = $current.UV.raw
> <tr>
> <td class="stats_label">UV</td>
> #if $current_UV <= 2.4
> <td class="stats_data" style="background-color:
> limegreen">$current.UV</td>
> #else if $current_UV >= 2.5 and $current_UV <= 5.4
> <td class="stats_data" style="background-color: yellow">$current.UV</td>
> #else if $current_UV >= 5.5 and $current_UV <= 7.4
> <td class="stats_data" style="background-color: orange">$current.UV</td>
> #else if $current_UV >= 7.5 and $current_UV <= 10.4
> <td class="stats_data" style="background-color: red">$current.UV</td>
> #else
> <td class="stats_data" style="background-color: violet">$current.UV</td>
> #end if
> </tr>
> #end if
>
> -tk
>
>
>
> On Sun, Jun 25, 2017 at 9:49 AM, Thomas Carlin <[email protected]
> <javascript:>> wrote:
>
>> Thanks Tom, that looks like exactly what I need. Doing some testing this
>> morning, I get an error on
>> trend=trend_dict,
>>
>> NameError: global name 'trend_dict' is not defined
>>
>> Where does this dictionary originate?
>>
>> Unrelated to the original question, I noticed that my extension runs
>> several times (7 i think) for each report generation. It's trivial to
>> write a catch in so it only runs once, but i'm curious why this is. Could
>> you shed any light on this?
>>
>> -Thomas
>>
>>
>> On Saturday, June 24, 2017 at 8:25:07 PM UTC-6, Tom Keffer wrote:
>>>
>>> Not a simple question at all!
>>>
>>> Generally, yes, you can use something similar to the tags in your code
>>> by following the same path through the objects. For example,
>>>
>>> $day.outTemp.latest
>>>
>>> can be obtained by using
>>>
>>> stats = weewx.tags.TimeBinder(
>>> db_lookup,
>>> timespan.stop,
>>> formatter=self.generator.formatter,
>>> converter=self.generator.converter,
>>> week_start=self.generator.stn_info.week_start,
>>> rain_year_start=self.generator.stn_info.rain_year_start,
>>> trend=trend_dict,
>>> skin_dict=self.generator.skin_dict)
>>>
>>> latest = stats.day.outTemp.latest
>>>
>>> This is basically all Cheetah is doing!
>>>
>>> Hope this helps.
>>>
>>> -tk
>>>
>>>
>>> On Sat, Jun 24, 2017 at 8:39 AM, Thomas Carlin <[email protected]>
>>> wrote:
>>>
>>>> Good morning everyone,
>>>>
>>>> I have a custom search list extension that I am working on to do some
>>>> analysis on my collected data, and I have it to the point that I am
>>>> pulling
>>>> the data out, and can manipulate it, but to do so, I had to define my own
>>>> timespan/binder inside my script. (The historygenerator extension does
>>>> the
>>>> same thing).
>>>>
>>>> Is there any way to use the weewx defined 'latest' or 'current'
>>>> timespan inside my python extension? Please forgive me if this is a
>>>> simple
>>>> question, the only programing experience that I have is self-inflicted,
>>>> and
>>>> far from complete.
>>>>
>>>> Thank you!
>>>>
>>>> --
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>>>>
>>>
>>> --
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>
>
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