code: def gpg_unstash_key( appname, key_id, config_dir=None, gpghome=None ):
      
  
      assert is_valid_appname(appname)
      if gpghome is None:
          config_dir = get_config_dir( config_dir )
          keydir = get_gpg_home( appname, config_dir=config_dir )
      else:
          keydir = gpghome
  
      gpg = gnupg.GPG( homedir=keydir )
      res = gpg.delete_keys( [key_id] )
      if res.status == 'Must delete secret key first':
          # this is a private key 
          res = gpg.delete_keys( [key_id], secret=True )
  
      try:
          assert res.status == 'ok', "Failed to delete key (%s)" % res
      except AssertionError, e:
          log.exception(e)
          log.error("Failed to delete key '%s'" % key_id)
          log.debug("res: %s" % res.__dict__)
          return False
  
      return True
docs: Remove a public key locally from our local app keyring
      Return True on success
      Return False on error