code: def create_field(subfields=None, ind1=' ', ind2=' ', controlfield_value='',
                   global_position=-1):
      
      if subfields is None:
          subfields = []
  
      ind1, ind2 = _wash_indicators(ind1, ind2)
      field = (subfields, ind1, ind2, controlfield_value, global_position)
      _check_field_validity(field)
      return field
docs: Return a field created with the provided elements.
  
      Global position is set arbitrary to -1.