title: Is it possible to use one parameter in another in AWS Data Pipeline?
body: <p><strong>Current setup:</strong></p>
  
  <p>There's a master data source that contains attendance records per day for students in a given school.  Imagine the data is structured in a CSV format like so:</p>
  
  <p>name|day|in_attendance</p>
  
  <p>jack|01/01/2018|0</p>
  
  <p>and so on and so forth, throughout the entire year.  Now, the way we grab attendance information from a specific period in time is to specify the year &amp; month via parameters we're handing to an AWS Datapipeline Step, like so:</p>
  
  <p><code>myAttendanceLookupStep: PYTHON=python34,s3://school_attendance_lookup.py,01,2018</code></p>
  
  <p>that step runs the Python file defined, and <code>01</code> and <code>2018</code> specify month and year we're looking up.  However, I want to change it so that it looks more like this:</p>
  
  <p><code>
  myAttendanceLookupStep: PYTHON=python34,s3://school_attendance_lookup.py,%myYear,%myMonth
  myYear: 2018
  myMonth: 01</code></p>
  
  <p>Is there any way to achieve this kind of behavior in AWS Data Pipeline? </p>