Python Node

Overview

Use Python Task to create a python-type task and execute python scripts. When the worker executes Python Task, it will generate a temporary python script, and executes the script by the Linux user with the same name as the tenant.

Create Task

• Click Project Management -> Project Name -> Workflow Definition, and click the Create Workflow button to enter the DAG editing page.
• Drag from the toolbar to the canvas.

Task Parameter

• Please refer to DolphinScheduler Task Parameters Appendix for default parameters.

Task Example

Simply Print

This example simulates a common task that runs by a simple command. The example is to print one line in the log file, as shown in the following figure: “This is a demo of python task”.

print("This is a demo of python task")

Custom Parameters

This example simulates a custom parameter task. We use parameters for reusing existing tasks as template or coping with the dynamic task. In this case, we declare a custom parameter named “param_key”, with the value “param_val”. Then we use echo to print the parameter “${param_key}” we just declared. After running this example, we would see “param_val” print in the log.

print("${param_key}")