def _add_unique_file(self, item):
        """
        adds a file in self.config['files'] only if not present already
        """
        if item not in self.config['files']:
            self.config['files'].append(item)
def _add_unique_file(self, item):
        """
        adds a file in self.config['files'] only if not present already
        """
        if item not in self.config['files']:
            self.config['files'].append(item)
def _add_unique_file ( self , item ) : if item not in self . config [ 'files' ] : self . config [ 'files' ] . append ( item )
adds a file in self.config['files'] only if not present already
adds a file in self . config [ files ] only if not present already