code: def retire_subjects(self, subjects, reason='other'):
          
  
          subjects = [ s.id if isinstance(s, Subject) else s for s in subjects ]
  
          return Workflow.http_post(
              '{}/retired_subjects'.format(self.id),
              json={
                  'subject_ids': subjects,
                  'retirement_reason': reason
              }
          )
docs: Retires subjects in this workflow.
  
          - **subjects** can be a list of :py:class:`Subject` instances, a list
            of subject IDs, a single :py:class:`Subject` instance, or a single
            subject ID.
          - **reason** gives the reason the :py:class:`Subject` has been retired.
            Defaults to **other**.
  
          Examples::
  
              workflow.retire_subjects(1234)
              workflow.retire_subjects([1,2,3,4])
              workflow.retire_subjects(Subject(1234))
              workflow.retire_subjects([Subject(12), Subject(34)])