From a post by @Didgeridrew
In automations, YAML variables can be defined multiple places, their scope depends on where they are defined.
trigger_variables:
var_1: true #script-wide (only Limited Templates and static values allowed)
trigger:
- platform: template
value_template: "{{ states('binary_sensor.x') | bool == var_1 }}"
variables:
var_2: "{{ false }}" #script-wide but, if you have multiple triggers, this value applies only when this specific trigger initiates the automation
variables:
var_3: "{{ true }}" #script-wide
condition:
- variables:
var_4: "{{ true }}" #local to condition block
action:
- variables:
var_5: "{{ true }}" #local to action block
- choose:
- conditions:
- condition: template
value_template: "{{ var_2 }}"
sequence:
- variables:
var_6: "{{ false }}" #local to this Option of this Choose action
- Variables will be populated with values roughly in the order I have numbered above.
