docstr: Return release in which this feature will become mandatory.
  
  This is a 5-tuple, of the same form as sys.version_info, or, if
  the feature was dropped, or the release date is undetermined, is None.
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code: def getMandatoryRelease(self):
      """Return release in which this feature will become mandatory.
  
      This is a 5-tuple, of the same form as sys.version_info, or, if
      the feature was dropped, or the release date is undetermined, is None.
      """
      return self.mandatory
  
label_desc: Use image node_id 3 for calling the _Feature obj's underlying member method code with example usage: obj.getMandatoryRelease() and returns: self