The immediate if filter does not short-circuit like you might expect with a typical conditional statement. The following example results in the number 20.001: The examples below show the output of a temperature sensor with state 20.001, unit ☌ and user configured presentation rounding set to 1 decimal. Script : msg_who_is_home : sequence : - service : notify.notify data : message : > To keep a clear overview, consider using YAML multiline strings to define your templates: Navigate to Developer Tools > Template, create your template in the Template editor and check the results on the right. The frontend has a template editor tool to help develop and debug templates. We will not go over the basics of the syntax, as Jinja2 does a great job of this in their templates documentation. Jinja2 supports a wide variety of operations: This means that we are using their syntax and make some custom Home Assistant variables available to templates during rendering. Templating in Home Assistant is powered by the Jinja2 templating engine. Process incoming data from sources that provide raw data, like MQTT, rest sensor or the command_line sensor.Formatting outgoing messages in, for example, the notify platforms and Alexa integration.Templating is a powerful feature that allows you to control information going into and out of the system. Home Assistant architecture, especially states.This is an advanced feature of Home Assistant.
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