old_contents: from datetime import datetime, timedelta
  
  from sqlalchemy_dict.utils import format_iso_datetime, format_iso_time, to_camel_case
  from sqlalchemy_dict.constants import ISO_DATETIME_FORMAT, ISO_DATE_FORMAT, ISO_DATETIME_PATTERN
  
  
  class Formatter:
  
      @classmethod
      def export_key(cls, key):
          raise NotImplemented
  
      @classmethod
      def export_datetime(cls, value):
          raise NotImplemented
  
      @classmethod
      def export_date(cls, value):
          raise NotImplemented
  
      @classmethod
      def export_time(cls, value):
          raise NotImplemented
  
      @classmethod
      def import_datetime(cls, value):
          raise NotImplemented
  
      @classmethod
      def import_date(cls, value):
          raise NotImplemented
  
      @classmethod
      def import_time(cls, value):
          raise NotImplemented
  
  
  class DefaultFormatter(Formatter):
      """
      Default Formatter
      """
      _zero = timedelta()
  
      @classmethod
      def export_key(cls, key):
          return to_camel_case(key)
  
      @classmethod
      def export_datetime(cls, value):
          return format_iso_datetime(value)
  
      @classmethod
      def export_date(cls, value):
          return value.isoformat()
  
      @classmethod
      def export_time(cls, value):
          return format_iso_time(value)
  
      @classmethod
      def import_datetime(cls, value):
          match = ISO_DATETIME_PATTERN.match(value)
          if not match:
              raise ValueError('Invalid datetime format')
          return datetime.strptime(match.groups()[0], ISO_DATETIME_FORMAT)
  
      @classmethod
      def import_date(cls, value):
          try:
              return datetime.strptime(value, ISO_DATE_FORMAT).date()
          except ValueError:
              raise ValueError('Invalid date format')
  
      @classmethod
      def import_time(cls, value):
          pass
  
new_contents: from datetime import datetime, timedelta
  
  from sqlalchemy_dict.utils import format_iso_datetime, format_iso_time, to_camel_case
  from sqlalchemy_dict.constants import ISO_DATETIME_FORMAT, ISO_DATE_FORMAT, ISO_DATETIME_PATTERN
  
  
  class Formatter:
  
      @classmethod
      def export_key(cls, key):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def export_datetime(cls, value):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def export_date(cls, value):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def export_time(cls, value):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def import_datetime(cls, value):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def import_date(cls, value):
          raise NotImplemented  # pragma: no cover
  
      @classmethod
      def import_time(cls, value):
          raise NotImplemented  # pragma: no cover
  
  
  class DefaultFormatter(Formatter):
      """
      Default Formatter
      """
      _zero = timedelta()
  
      @classmethod
      def export_key(cls, key):
          return to_camel_case(key)
  
      @classmethod
      def export_datetime(cls, value):
          return format_iso_datetime(value)
  
      @classmethod
      def export_date(cls, value):
          return value.isoformat()
  
      @classmethod
      def export_time(cls, value):
          return format_iso_time(value)
  
      @classmethod
      def import_datetime(cls, value):
          match = ISO_DATETIME_PATTERN.match(value)
          if not match:
              raise ValueError('Invalid datetime format')
          return datetime.strptime(match.groups()[0], ISO_DATETIME_FORMAT)
  
      @classmethod
      def import_date(cls, value):
          try:
              return datetime.strptime(value, ISO_DATE_FORMAT).date()
          except ValueError:
              raise ValueError('Invalid date format')
  
      @classmethod
      def import_time(cls, value):
          pass
  
subject: Exclude abstracts from coverage