old_contents: from abc import ABCMeta
  from twisted.mail.smtp import ESMTPSender
  
  class myESMTPSender(ESMTPSender, metaclass=ABCMeta):
      def _getContextFactory(self):
          if self.context is not None:
              return self.context
          try:
              from twisted.internet import ssl
          except ImportError:
              return None
          else:
              try:
                  context = ssl.ClientContextFactory()
                  return context
              except AttributeError:
                  return None
  
new_contents: from abc import ABCMeta
  from twisted.mail.smtp import ESMTPSender
  
  
  class myESMTPSender(ESMTPSender, metaclass=ABCMeta):
      def _getContextFactory(self):
          if self.context is not None:
              return self.context
          try:
              from twisted.internet import ssl
          except ImportError:
              return None
          else:
              try:
                  context = ssl.ClientContextFactory()
                  return context
              except AttributeError:
                  return None
  
subject: fix veritcal spacing before class definition