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https://issues.apache.org/jira/browse/AIRFLOW-436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15571612#comment-15571612
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Sumit Maheshwari commented on AIRFLOW-436:
------------------------------------------

Thanks [~lauralorenz] for detailed explanation. 

> Incorrect templating when used with .format
> -------------------------------------------
>
>                 Key: AIRFLOW-436
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-436
>             Project: Apache Airflow
>          Issue Type: Bug
>            Reporter: Sumit Maheshwari
>
> Found that when {{.format}} is used in a templatable field, it produces weird 
> results. For example:
> {code:none}
> t3 = BashOperator(
>     task_id='wget',
>     bash_command="wget {0}/{{ ds }}".format('google.com'),
>     dag=dag)
> {code}
> produces following result:
> {code:none}
> {bash_operator.py:79} INFO - Running command: wget google.com/{ ds }
> {code}
> But if we change {{bash_command}} to following, it works as expected:
> {code:none}
> bash_command="wget %s/{{ ds }}"%('google.com')
> {code}
> {code:none}
> {bash_operator.py:79} INFO - Running command: wget google.com/2016-08-05
> {code}



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