#NEWLINE# def find( self , source , issuer ) : #NEWLINE# #INDENT# '\n        Find a key bundle\n        :param source: A url\n        :param issuer: The issuer of keys\n        ' #NEWLINE# try : #NEWLINE# #INDENT# for kb in self . issuer_keys [ issuer ] : #NEWLINE# #INDENT# if ( kb . source == source ) : #NEWLINE# #INDENT# return source #NEWLINE# #UNINDENT# #UNINDENT# #UNINDENT# except KeyError : #NEWLINE# #INDENT# return None