Using now() will cause templates to be refreshed at the start of every new minute.You can also use: now().second, now().minute, now().hour, now().day, now().month, now().year, now().weekday() and now().isoweekday() and other datetime attributes and functions.Now() returns a datetime object that represents the current time in your time zone. Now(), relative_time(), today_at(), and utcnow() are not supported in limited templates. This form of the expression short-circuits so if the platform is event the expression trigger.to_state.state will never be evaluated and won’t cause an error. Instead you have to do this if atform = 'event' else trigger.to_state.state. This won’t work because both expressions will be evaluated and one will fail since the field doesn’t exist. This means you cannot use this filter to prevent executing an expression which would result in an error.įor example, if you wanted to select a field from trigger in an automation based on the platform you might go to make this template: atform = 'event' | iif(, trigger.to_state.state). The if_true, if_false and if_none expressions will all be evaluated and the filter will simply return one of the resulting values. 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.It also enables us to read the JSON in the DataFrame formate of Pandas.This is an advanced feature of Home Assistant. Q2: How do I read a JSON file into a DataFrame in Python?Īnswer: To read the JSON file into a DataFrame, built-in function read_json() can be used. Such a file may contain any specific JSON object. Frequently asked questions:Īnswer: Built-in function json.load() in the Python library is used to read the content of a JSON file. It must be noted that the default value of indent will be None, and the default value of sort_keys will be “False”. Also, the keys are sorted in ascending order due to the “True” flag value for the “sort_keys” parameter. In the above-mentioned code, indentation is of 5 spaces. # Pretty printing with indentation and sorting Print(json.dumps(staff_dict, indent=5, sort_keys=True)) In Python working with the JSON data is being facilitated through the built-in package. Therefore, it is the text format that is completely language-independent. Also, it is easily parsed and generated by the machines. JSON is a lightweight data format, suitable for data interchange and also it can be easily read and written by humans. In Python, JSON is found in the form of a string. The JSON format is commonly used to transmit and receive data between the server and web application. It is a popular data format used for the representation of structured data. 1.10 Frequently asked questions: IntroductionĮxpansion of JSON is the JavaScript Object Notation.
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