Jinja2 reject/select filter and sorting out zero values in list

Configuration
,
1

Hi!
I have a template sensor, which renders average temperature at my house.

- platform: template
  sensors:
    temperature_home:
       value_template: >
        {% set temperatures = [
               states("sensor.temp1") | float,
               states("sensor.temp2") | float,
               states("sensor.temp3") | float
           ] %}
        {{ (temperatures | sum / temperatures | count) | round(1) }}

Works pretty good, but sometimes one of the sensors shows 0 value (looks like a problem with Netatmo platform) and an average value becomes wrong. I’m trying to sort out zero values, but haven’t found a simple solution yet. I tried

{{ (temperatures | sum / (temps | reject("==","0") | count)) }}

reject jinja2 filter should return a list without zero values, but instead it returns <generator object select_or_reject at ...> and doesn’t work with count filter.
Does anybody familiar with how reject (or select) filter works? Or maybe my issue could be solved even simplier)

2

its expecting this to be in a for loop, it can’t be used like this. Luckly there’s another filter that will work for you on top of that, the ‘list’ filter. It turns generators into lists.

{{ mylist | reject("==", 0) | list }}

Just make sure you don’t put 0 in quotes because that will be looking for strings. So in your example:

{% set temps = temperatures | reject("==", 0) | list %}
{{ ( temps | sum / temps | count ) | round(1) }}

EDIT: I fixed it again. This should work.

2 Likes
3

Thanks! It works.
Just a little mistake here:

{% set temps = temperatures | reject("==", 0) | list %}
    ^
1 Like
4

ah yep, ill edit my post for future goers

5

Is there any documentation on how select and/or reject work? I am trying to find all switches whose object_id starts with a certain string, and return true if any of them are on – basically the functionality of a group.

I’m imagining it’s something like this:

{%- set switches = states.switch 
  | map(attribute='entity_id') 
  | select('startswith', 'switch.multipower1_')
  | list -%}
6

According to Jinja2’s documentations, select supports all built-in tests.

There’s no ‘startswith’ (or equivalent) test in that list and the closest one (but not very) is in.

7

I was hoping I could use a template to accomplish this, but I just ended up using a group. Oh well.