BobDu commented on code in PR #27316:
URL: https://github.com/apache/airflow/pull/27316#discussion_r1006950778
##########
docs/apache-airflow/best-practices.rst:
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@@ -213,6 +213,30 @@ or if you need to deserialize a json object from the
variable :
{{ var.json.<variable_name> }}
+Ensure use variable with template in operator, not get it in top level code.
+
+Bad example:
+
+.. code-block:: python
+
+ from airflow.models import Variable
+
+ foo_var = Variable.get("foo")
+ bash_use_variable_bad = BashOperator(
+ task_id="bash_use_variable_bad", bash_command="echo variable
foo=${foo_env}", env={"foo_env": foo_var}
+ )
+
+Good example:
+
+.. code-block:: python
+
+ bash_use_variable_good = BashOperator(
+ task_id="bash_use_variable_good",
+ bash_command="echo variable foo=${foo_env}",
+ env={"foo_env": "{{ var.value.get('foo') }}"},
+ )
+
+
Review Comment:
? `bash_command="echo variable foo=${Variable.get('foo')}"` is not a
effective syntax.
Are you want to say `bash_command=f"echo variable
foo={Variable.get('foo')}"` ?
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