title: Airflow Python Script with execution_date in op_kwargs
body: <p>With assistance from this answer <a href="https://stackoverflow.com/a/41730510/4200352">https://stackoverflow.com/a/41730510/4200352</a> I am executing a python file.</p>
  
  <p>I use PythonOperator and am trying to include the execution date as an argument passed to the script.</p>
  
  <p>I believe I can access it somehow through kwargs['execution_date'].</p>
  
  <p>The below fails</p>
  
  <p><strong>DAG.py</strong></p>
  
  <pre><code>from airflow import DAG
  from airflow.operators.python_operator import PythonOperator
  from datetime import datetime, timedelta
  
  import sys
  import os
  sys.path.append(os.path.abspath("/home/glsam/OmegaAPI/airflow/scripts/PyPer_ogi_simple"))
  from update_benchmarks import *
  
  
  default_args = {
      'owner': 'airflow',
      'depends_on_past': False,
      'start_date': datetime(2018, 4, 23),
      'email': ['airflow@example.com'],
      'email_on_failure': False,
      'email_on_retry': False,
      'retries': 1,
      'retry_delay': timedelta(minutes=5),
  }
  
  dag = DAG('run_pyPer', default_args=default_args)
  
  update_BM_G027 = PythonOperator(
      task_id='update_BM_G027',
      python_callable=update_bmk,
      dag=dag,
      op_kwargs={
          'bmk_code': 'G027',
          'is_hedged': False,
          'from_date': kwargs['execution_date'],
      })
  </code></pre>
  
  <p>Do maybe i need to use this answer to get the date then XCOM it to the task? <a href="https://stackoverflow.com/a/36754930/4200352">https://stackoverflow.com/a/36754930/4200352</a></p>