#NEWLINE# def __setitem__( self , key , value ) : #NEWLINE# #INDENT# 'Set an item\n        ' #NEWLINE# if ( self . base is None ) : #NEWLINE# #INDENT# raise KeyError ( 'Mapping has not been initialized' ) #NEWLINE# #UNINDENT# ( section , subkey ) = self . __descend_sections ( key , create = True ) #NEWLINE# section [ subkey ] = value