(self)
Return a list of string keys representing the local
        columns in this :class:`.ForeignKeyConstraint`.

        This list is either the original string arguments sent
        to the constructor of the :class:`.ForeignKeyConstraint`,
        or if the constraint has been initialized with :class:`.Column`
        objects, is the string .key of each element.

        .. versionadded:: 1.0.0
Return a list of string keys representing the local
        columns in this :class:`.ForeignKeyConstraint`.
Return a list of string keys representing the local columns in this : class : . ForeignKeyConstraint .
def column_keys(self):
        """Return a list of string keys representing the local
        columns in this :class:`.ForeignKeyConstraint`.

        This list is either the original string arguments sent
        to the constructor of the :class:`.ForeignKeyConstraint`,
        or if the constraint has been initialized with :class:`.Column`
        objects, is the string .key of each element.

        .. versionadded:: 1.0.0

        """
        if hasattr(self, "parent"):
            return self.columns.keys()
        else:
            return [
                col.key if isinstance(col, ColumnElement) else str(col)
                for col in self._pending_colargs
            ]
def column_keys ( self ) : if hasattr ( self , "parent" ) : return self . columns . keys ( ) else : return [ col . key if isinstance ( col , ColumnElement ) else str ( col ) for col in self . _pending_colargs ]