old_contents: from sqlalchemy.ext.associationproxy import _AssociationList
  
  from flask_admin.model.typefmt import BASE_FORMATTERS, EXPORT_FORMATTERS, \
      list_formatter
  from sqlalchemy.orm.collections import InstrumentedList
  
  
  def choice_formatter(view, choice):
      """
          Return label of selected choice
          see https://sqlalchemy-utils.readthedocs.io/
  
          :param choice:
              sqlalchemy_utils Choice, which has a `code` and a `value`
      """
      return choice.value
  
  
  def arrow_formatter(view, arrow_time):
      """
          Return human-friendly string of the time relative to now.
          see https://arrow.readthedocs.io/
  
          :param arrow_time:
              Arrow object for handling datetimes
      """
      return arrow_time.humanize()
  
  
  def arrow_export_formatter(view, arrow_time):
      """
          Return string representation of Arrow object
          see https://arrow.readthedocs.io/
  
          :param arrow_time:
              Arrow object for handling datetimes
      """
      return arrow_time.format()
  
  
  DEFAULT_FORMATTERS = BASE_FORMATTERS.copy()
  EXPORT_FORMATTERS = EXPORT_FORMATTERS.copy()
  
  DEFAULT_FORMATTERS.update({
      InstrumentedList: list_formatter,
      _AssociationList: list_formatter,
  })
  try:
      from sqlalchemy_utils import Choice
      DEFAULT_FORMATTERS[Choice] = choice_formatter
  except ImportError:
      pass
      
  try:
      from arrow import Arrow
      DEFAULT_FORMATTERS[Arrow] = arrow_formatter
      EXPORT_FORMATTERS[Arrow] = arrow_export_formatter
  except ImportError:
      pass
  
new_contents: from sqlalchemy.ext.associationproxy import _AssociationList
  
  from flask_admin.model.typefmt import BASE_FORMATTERS, EXPORT_FORMATTERS, \
      list_formatter
  from sqlalchemy.orm.collections import InstrumentedList
  
  
  def choice_formatter(view, choice):
      """
          Return label of selected choice
          see https://sqlalchemy-utils.readthedocs.io/
  
          :param choice:
              sqlalchemy_utils Choice, which has a `code` and a `value`
      """
      return choice.value
  
  
  def arrow_formatter(view, arrow_time):
      """
          Return human-friendly string of the time relative to now.
          see https://arrow.readthedocs.io/
  
          :param arrow_time:
              Arrow object for handling datetimes
      """
      return arrow_time.humanize()
  
  
  def arrow_export_formatter(view, arrow_time):
      """
          Return string representation of Arrow object
          see https://arrow.readthedocs.io/
  
          :param arrow_time:
              Arrow object for handling datetimes
      """
      return arrow_time.format()
  
  
  DEFAULT_FORMATTERS = BASE_FORMATTERS.copy()
  EXPORT_FORMATTERS = EXPORT_FORMATTERS.copy()
  
  DEFAULT_FORMATTERS.update({
      InstrumentedList: list_formatter,
      _AssociationList: list_formatter,
  })
  try:
      from sqlalchemy_utils import Choice
      DEFAULT_FORMATTERS[Choice] = choice_formatter
  except ImportError:
      pass
  
  try:
      from arrow import Arrow
      DEFAULT_FORMATTERS[Arrow] = arrow_formatter
      EXPORT_FORMATTERS[Arrow] = arrow_export_formatter
  except ImportError:
      pass
  
subject: Remove whitespace.