docs: def get_staff(self, gradebook_id, simple=False):
          """Get staff list for gradebook.
  
          Get staff list for the gradebook specified. Optionally, return
          a less detailed list by specifying ``simple = True``.
  
          If simple=True, return a list of dictionaries, one dictionary
          for each member. The dictionary contains a member's ``email``,
          ``displayName``, and ``role``. Members with multiple roles will
          appear in the list once for each role.
  
          Args:
              gradebook_id (str): unique identifier for gradebook, i.e. ``2314``
              simple (bool): Return a staff list with less detail. Default
                  is ``False``.
  
          Returns:
  
              An example return value is:
  
              .. code-block:: python
  
                  {
                      u'data': {
                          u'COURSE_ADMIN': [
                              {
                                  u'accountEmail': u'benfranklin@mit.edu',
                                  u'displayName': u'Benjamin Franklin',
                                  u'editable': False,
                                  u'email': u'benfranklin@mit.edu',
                                  u'givenName': u'Benjamin',
                                  u'middleName': None,
                                  u'mitId': u'921344431',
                                  u'nickName': u'Benjamin',
                                  u'personId': 10710616,
                                  u'sortableName': u'Franklin, Benjamin',
                                  u'surname': u'Franklin',
                                  u'year': None
                              },
                          ],
                          u'COURSE_PROF': [
                              {
                                  u'accountEmail': u'dduck@mit.edu',
                                  u'displayName': u'Donald Duck',
                                  u'editable': False,
                                  u'email': u'dduck@mit.edu',
                                  u'givenName': u'Donald',
                                  u'middleName': None,
                                  u'mitId': u'916144889',
                                  u'nickName': u'Donald',
                                  u'personId': 8117160,
                                  u'sortableName': u'Duck, Donald',
                                  u'surname': u'Duck',
                                  u'year': None
                              },
                          ],
                          u'COURSE_TA': [
                              {
                                  u'accountEmail': u'hduck@mit.edu',
                                  u'displayName': u'Huey Duck',
                                  u'editable': False,
                                  u'email': u'hduck@mit.edu',
                                  u'givenName': u'Huey',
                                  u'middleName': None,
                                  u'mitId': u'920445024',
                                  u'nickName': u'Huey',
                                  u'personId': 1299059,
                                  u'sortableName': u'Duck, Huey',
                                  u'surname': u'Duck',
                                  u'year': None
                              },
                          ]
                      },
                  }
  
  
          """
          staff_data = self.get(
              'staff/{gradebookId}'.format(
                  gradebookId=gradebook_id or self.gradebook_id
              ),
              params=None,
          )
          if simple:
              simple_list = []
              unraveled_list = self.unravel_staff(staff_data)
              for member in unraveled_list.__iter__():
                  simple_list.append({
                      'accountEmail': member['accountEmail'],
                      'displayName': member['displayName'],
                      'role': member['role'],
                  })
              return simple_list
          return staff_data['data']