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keyboard_arrow_down Step-by-Step - Writing Your First DAG
Data Engineering Path  ·  Airflow
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Hands-On Quiz — Writing DAGs

Practice Exercises

Exercise 1: Build a Weather ETL

Create a complete DAG that:

  1. Extracts weather data from a public API (OpenWeatherMap)
  2. Transforms the JSON response into a clean format
  3. Logs the results (simulating a database load)
  4. Uses Jinja templating for the date parameter

Exercise 2: Write DAG Tests

Write pytest tests for the DAG from Exercise 1:

  1. Test that the DAG loads without errors
  2. Test the transform function with sample data
  3. Test error handling when the API returns empty data

Exercise 3: Deploy and Monitor

  1. Place your DAG in the Airflow DAGs folder
  2. Verify it appears in the UI
  3. Trigger a manual run
  4. Check the logs for each task
  5. Review the execution in the Gantt view
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