old_contents: """General helper methods and classes."""
  
  import re
  
  import sqlalchemy.types as sqlt
  
  
  class SqlEnumType(sqlt.SchemaType, sqlt.TypeDecorator):
      """Type class for storing a python3 enum in SQL.
  
      Derived from: http://techspot.zzzeek.org/2011/01/14/the-enum-recipe/
      """
  
      def __init__(self, enum_cls):
          """Given an enum.Enum creat a sqlalchemy type to store it."""
          super().__init__()
          values = [member.name for member in enum_cls.__members__.values()]
          name = 'ck{}'.format(re.sub(
              '([A-Z])', lambda match: '_' + match.group(1).lower(),
              enum_cls.__name__))
          self.enum = enum_cls
          self.impl = sqlt.Enum(*values, name=name)
  
      def _set_table(self, column, table):
          self.impl._set_table(column, table)  # pylint: disable=protected-access
  
      def copy(self):
          return self.__class__(self.enum)
  
      def process_literal_param(self, value, _dialect):
          return value
  
      def process_bind_param(self, value, _dialect):
          return None if value is None else value.name
  
      def process_result_value(self, value, _dialect):
          return None if value is None else getattr(self.enum, value)
  
new_contents: """General helper methods and classes."""
  
  import re
  
  import sqlalchemy.types as sqlt
  
  
  class SqlEnumType(sqlt.SchemaType, sqlt.TypeDecorator):
      """Type class for storing a python3 enum in SQL.
  
      Derived from: http://techspot.zzzeek.org/2011/01/14/the-enum-recipe/
      """
  
      def __init__(self, enum_cls):
          """Given an enum.IntEnum create a sqlalchemy type to store it."""
          super().__init__()
          values = [member.name for member in enum_cls.__members__.values()]
          name = 'ck{}'.format(re.sub(
              '([A-Z])', lambda match: '_' + match.group(1).lower(),
              enum_cls.__name__))
          self.enum = enum_cls
          self.impl = sqlt.Enum(*values, name=name)
  
      def _set_table(self, column, table):
          self.impl._set_table(column, table)  # pylint: disable=protected-access
  
      def copy(self):
          return self.__class__(self.enum)
  
      def process_literal_param(self, value, _dialect):
          return value
  
      def process_bind_param(self, value, _dialect):
          return None if value is None else value.name
  
      def process_result_value(self, value, _dialect):
          return None if value is None else getattr(self.enum, value)
  
subject: Fix docstring.