Method __init__

lib/sqlalchemy/sql/schema.py:5620–5684

r"""Construct an index object. :param name: The name of the index :param \*expressions: Column expressions to include in the index. The expressions are normally instances of :class:`_schema.Column`, but may also be arbitrary SQL expressions

(
        self,
        name: Optional[str],
        *expressions: _DDLColumnArgument,
        unique: bool = False,
        quote: Optional[bool] = None,
        info: Optional[_InfoType] = None,
        _table: Optional[Table] = None,
        _column_flag: bool = False,
        **dialect_kw: Any,
    )

    _table_bound_expressions: _typing_Sequence[ColumnElement[Any]]

    def __init__(
        self,
        name: Optional[str],
        *expressions: _DDLColumnArgument,
        unique: bool = False,
        quote: Optional[bool] = None,
        info: Optional[_InfoType] = None,
        _table: Optional[Table] = None,
        _column_flag: bool = False,
        **dialect_kw: Any,
    ) -> None:
        r"""Construct an index object.

        :param name:
          The name of the index

        :param \*expressions:
          Column expressions to include in the index.   The expressions
          are normally instances of :class:`_schema.Column`, but may also
          be arbitrary SQL expressions which ultimately refer to a
          :class:`_schema.Column`.

        :param unique=False:
            Keyword only argument; if True, create a unique index.

        :param quote=None:
            Keyword only argument; whether to apply quoting to the name of
            the index.  Works in the same manner as that of
            :paramref:`_schema.Column.quote`.

        :param info=None: Optional data dictionary which will be populated
            into the :attr:`.SchemaItem.info` attribute of this object.

        :param \**dialect_kw: Additional keyword arguments not mentioned above
            are dialect specific, and passed in the form
            ``<dialectname>_<argname>``. See the documentation regarding an
            individual dialect at :ref:`dialect_toplevel` for detail on
            documented arguments.

        """
        self.table = table = None

        self.name = quoted_name.construct(name, quote)
        self.unique = unique
        if info is not None:
            self.info = info

        # TODO: consider "table" argument being public, but for
        # the purpose of the fix here, it starts as private.
        if _table is not None:
            table = _table

        self._validate_dialect_kwargs(dialect_kw)

        self.expressions = []
        # will call _set_parent() if table-bound column
        # objects are present
        ColumnCollectionMixin.__init__(