def get_property_names(self):
        '''
        Returns all property names in this collection of signatures
        '''
        property_names = set()
        for signature_value in self.values():
            for property_name in signature_value.keys():
                property_names.add(property_name)
        return property_names
def get_property_names ( self ) : property_names = set ( ) for signature_value in self . values ( ) : for property_name in signature_value . keys ( ) : property_names . add ( property_name ) return property_names
Returns all property names in this collection of signatures