Method __init__

lib/sqlalchemy/sql/schema.py:4354–4396

r""" :param \*columns: A sequence of column names or Column objects. :param name: Optional, the in-database name of this constraint. :param deferrable: Optional bool. If set, emit DEFERRABLE or NOT DEFERRABLE when issuing DDL for thi

(
        self,
        *columns: _DDLColumnArgument,
        name: _ConstraintNameArgument = None,
        deferrable: Optional[bool] = None,
        initially: Optional[str] = None,
        info: Optional[_InfoType] = None,
        _autoattach: bool = True,
        _column_flag: bool = False,
        _gather_expressions: Optional[List[_DDLColumnArgument]] = None,
        **dialect_kw: Any,
    )

    """A constraint that proxies a ColumnCollection."""

    def __init__(
        self,
        *columns: _DDLColumnArgument,
        name: _ConstraintNameArgument = None,
        deferrable: Optional[bool] = None,
        initially: Optional[str] = None,
        info: Optional[_InfoType] = None,
        _autoattach: bool = True,
        _column_flag: bool = False,
        _gather_expressions: Optional[List[_DDLColumnArgument]] = None,
        **dialect_kw: Any,
    ) -> None:
        r"""
        :param \*columns:
          A sequence of column names or Column objects.

        :param name:
          Optional, the in-database name of this constraint.

        :param deferrable:
          Optional bool.  If set, emit DEFERRABLE or NOT DEFERRABLE when
          issuing DDL for this constraint.

        :param initially:
          Optional string.  If set, emit INITIALLY <value> when issuing DDL
          for this constraint.

        :param \**dialect_kw: other keyword arguments including
          dialect-specific arguments are propagated to the :class:`.Constraint`
          superclass.

        """
        Constraint.__init__(
            self,
            name=name,
            deferrable=deferrable,
            initially=initially,
            info=info,
            **dialect_kw,
        )
        ColumnCollectionMixin.__init__(
            self, *columns, _autoattach=_autoattach, _column_flag=_column_flag
        )

    columns: ReadOnlyColumnCollection[str, Column[Any]]
    """A :class:`_expression.ColumnCollection` representing the set of columns