[solved] Data_template with some {% ... %} before

Configuration
20

Here is my time of day sensor and the script I use to determine which temperature is appropriate resulting from that.
Use, pull apart or throw away as you see fit.

sensor:
  - platform: template
    sensors:
      heat_set_temperature:
        entity_id: climate.house_heat, input_number.in_heat_temp_control_val
        friendly_name: Heating Set Temperature
        value_template: "{{ state_attr('climate.house_heat', 'temperature') }}"
        icon_template: "{{'mdi:emoticon-cool' if ((state_attr('climate.house_heat', 'current_temperature') | float) >= (states('input_number.in_heat_temp_control_val') | float)) else 'mdi:emoticon-sad-outline'}}"
      heat_day_segment:
        entity_id: sensor.time
        friendly_name: Heating Segment
        value_template: >
          {% set time = states('sensor.time') %}
          {% set slt1start = states('input_datetime.id_heat_day_on') [0:5] %}
          {% set slt1stop = states('input_datetime.id_heat_evening_on') [0:5] %}
          {% set dy = (slt1start <= time < slt1stop) if (slt1start < slt1stop) else (slt1start <= time or time < slt1stop) %}
          {% set slt1start = states('input_datetime.id_heat_evening_on') [0:5] %}
          {% set slt1stop = states('input_datetime.id_heat_night_on') [0:5] %}
          {% set evng = (slt1start <= time < slt1stop) if (slt1start < slt1stop) else (slt1start <= time or time < slt1stop) %}
          {% set slt1start = states('input_datetime.id_heat_night_on') [0:5] %}
          {% set slt1stop = states('input_datetime.id_heat_day_on') [0:5] %}
          {% set nght = (slt1start <= time < slt1stop) if (slt1start < slt1stop) else (slt1start <= time or time < slt1stop) %}
          {% if dy %}Day{% elif evng %}Evening{% else %}Night{% endif %}
        icon_template: >
          {% set seg = states('sensor.heat_day_segment') %}
          {% if seg == 'Day' %}mdi:shovel{% elif seg == 'Evening' %}mdi:glass-cocktail{% else %}mdi:sleep{% endif %}

## resets temperature following any pattern change
  sc_heat_reset_value:
    alias: Heating Reset Value
    sequence:
    - service: input_number.set_value
      data_template:
        entity_id: input_number.in_heat_temp_control_val
        value: >
          {% if false and not is_state('binary_sensor.bs_door_open', 'on') %}
            {{ '6' | float }}
          {% elif not is_state('binary_sensor.bs_occupied', 'on') %}
            {{ states('input_number.in_heat_temp_away_val') | float }}
          {% elif is_state('sensor.heat_day_segment', 'Night') %}
            {{ states('input_number.in_heat_temp_night_val') | float }}
          {% elif is_state('sensor.heat_day_segment', 'Day') %}
            {{ states('input_number.in_heat_temp_day_val') | float }}
          {% else %}
            {{ states('input_number.in_heat_temp_evening_val') | float }}
          {% endif %}
#### end of template

I did a basic interpetation of jinja wrapped python in this post : -