docs: def qualify(qualification, value, worker):
      """Assign a qualification to a worker."""
      # create connection to AWS
      from boto.mturk.connection import MTurkConnection
      config = PsiturkConfig()
      config.load_config()
      aws_access_key_id = config.get('AWS Access', 'aws_access_key_id')
      aws_secret_access_key = config.get('AWS Access', 'aws_secret_access_key')
      conn = MTurkConnection(aws_access_key_id, aws_secret_access_key)
  
      def get_workers_with_qualification(qualification):
          """Get workers with the given qualification."""
          results = []
          continue_flag = True
          page = 1
          while(continue_flag):
              new_results = conn.get_qualifications_for_qualification_type(
                  qualification,
                  page_size=100,
                  page_number=page)
  
              if(len(new_results) == 0):
                  continue_flag = False
              else:
                  results.extend(new_results)
                  page = page + 1
  
          return results
  
      results = get_workers_with_qualification(qualification)
      workers = [x.SubjectId for x in results]
  
      # assign the qualification
      click.echo(
          "Assigning qualification {} with value {} to worker {}".format(
              qualification,
              value,
              worker))
  
      if worker in workers:
          result = conn.update_qualification_score(qualification, worker, value)
      else:
          result = conn.assign_qualification(qualification, worker, value)
  
      if result:
          click.echo(result)
  
      # print out the current set of workers with the qualification
      results = get_workers_with_qualification(qualification)
  
      click.echo("{} workers with qualification {}:".format(
          len(results),
          qualification))
  
      values = [r.IntegerValue for r in results]
      unique_values = list(set([r.IntegerValue for r in results]))
      for v in unique_values:
          click.echo("{} with value {}".format(
              len([val for val in values if val == v]),
              v))