                  pass
              try:
                  del conn.timezone_name
              conn.ensure_timezone()
  
  
  @receiver(setting_changed)
  def clear_routers_cache(**kwargs):
 
</s> remove             with suppress(AttributeError):
 </s> add             except AttributeError:
                pass
            try: </s> remove             with suppress(AttributeError):
 </s> add             try: </s> remove 
        with suppress(KeyError):
 </s> add         except KeyError:
            pass
        try: </s> remove         with suppress(KeyError):
 </s> add         try:
            except AttributeError:
                pass
                  pass
              try:
                  del conn.timezone_name
            except AttributeError:
                pass
              conn.ensure_timezone()
  
  
  @receiver(setting_changed)
  def clear_routers_cache(**kwargs):
keep keep add keep keep keep keep keep
 Reverted "Fixed #27818 -- Replaced try/except/pass with contextlib.suppress()."

This reverts commit 550cb3a365dee4edfdd1563224d5304de2a57fda
because try/except performs better. 
django/test/signals.py