What is context variable in Airflow operators

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What is context variable in Airflow operators

  1. How to solve What is context variable in Airflow operators

    When Airflow runs a task, it collects several variables and passes these to the context argument on the execute() method. These variables hold information about the current task, you can find the list here: https://airflow.apache.org/docs/apache-airflow/stable/macros-ref.html#default-variables.
    Information from the context can be used in your task, for example to reference a folder yyyymmdd, where the date is fetched from the variable ds_nodash, a variable in the context:
    def do_stuff(**context): data_path = f"/path/to/data/{context['ds_nodash']}" # write file to data_path... PythonOperator(task_id="do_stuff", python_callable=do_stuff)
    *context and **context are different Python notations for accepting arguments in a function. Google for “args vs kwargs” to find more on this topic. Basically *context accepts non-keyword arguments, while **context takes keyword arguments:
    def print_context(*context_nokeywords, **context_keywords): print(f"Non keywords args: {context_nokeywords}") print(f"Keywords args: {context_keywords}") print_context("a", "b", "c", a="1", b="2", c="3") # Non keywords args: ('a', 'b', 'c') # Keywords args: {'a': '1', 'b': '2', 'c': '3'}

  2. What is context variable in Airflow operators

    When Airflow runs a task, it collects several variables and passes these to the context argument on the execute() method. These variables hold information about the current task, you can find the list here: https://airflow.apache.org/docs/apache-airflow/stable/macros-ref.html#default-variables.
    Information from the context can be used in your task, for example to reference a folder yyyymmdd, where the date is fetched from the variable ds_nodash, a variable in the context:
    def do_stuff(**context): data_path = f"/path/to/data/{context['ds_nodash']}" # write file to data_path... PythonOperator(task_id="do_stuff", python_callable=do_stuff)
    *context and **context are different Python notations for accepting arguments in a function. Google for “args vs kwargs” to find more on this topic. Basically *context accepts non-keyword arguments, while **context takes keyword arguments:
    def print_context(*context_nokeywords, **context_keywords): print(f"Non keywords args: {context_nokeywords}") print(f"Keywords args: {context_keywords}") print_context("a", "b", "c", a="1", b="2", c="3") # Non keywords args: ('a', 'b', 'c') # Keywords args: {'a': '1', 'b': '2', 'c': '3'}

Solution 1

When Airflow runs a task, it collects several variables and passes these to the context argument on the execute() method. These variables hold information about the current task, you can find the list here: https://airflow.apache.org/docs/apache-airflow/stable/macros-ref.html#default-variables.

Information from the context can be used in your task, for example to reference a folder yyyymmdd, where the date is fetched from the variable ds_nodash, a variable in the context:

def do_stuff(**context):
    data_path = f"/path/to/data/{context['ds_nodash']}"
    # write file to data_path...

PythonOperator(task_id="do_stuff", python_callable=do_stuff)

*context and **context are different Python notations for accepting arguments in a function. Google for “args vs kwargs” to find more on this topic. Basically *context accepts non-keyword arguments, while **context takes keyword arguments:

def print_context(*context_nokeywords, **context_keywords):
    print(f"Non keywords args: {context_nokeywords}")
    print(f"Keywords args: {context_keywords}")

print_context("a", "b", "c", a="1", b="2", c="3")

# Non keywords args: ('a', 'b', 'c')
# Keywords args: {'a': '1', 'b': '2', 'c': '3'}

Original Author Bas Harenslak Of This Content

Conclusion

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