Method _create_storer

pandas/io/pytables.py:1823–1912

return a suitable class to operate

(
        self,
        group,
        format=None,
        value: DataFrame | Series | None = None,
        encoding: str = "UTF-8",
        errors: str = "strict",
    )

        return format

    def _create_storer(
        self,
        group,
        format=None,
        value: DataFrame | Series | None = None,
        encoding: str = "UTF-8",
        errors: str = "strict",
    ) -> GenericFixed | Table:
        """return a suitable class to operate"""
        cls: type[GenericFixed | Table]

        if value is not None and not isinstance(value, (Series, DataFrame)):
            raise TypeError("value must be None, Series, or DataFrame")

        pt = getattr(group._v_attrs, "pandas_type", None)
        tt = getattr(group._v_attrs, "table_type", None)

        # infer the pt from the passed value
        if pt is None:
            if value is None:
                _tables()
                assert _table_mod is not None  # for mypy
                if getattr(group, "table", None) or isinstance(
                    group, _table_mod.table.Table
                ):
                    pt = "frame_table"
                    tt = "generic_table"
                else:
                    raise TypeError(
                        "cannot create a storer if the object is not existing "
                        "nor a value are passed"
                    )
            else:
                if isinstance(value, Series):
                    pt = "series"
                else:
                    pt = "frame"

                # we are actually a table
                if format == "table":
                    pt += "_table"

        # a storer node
        if "table" not in pt:
            _STORER_MAP = {"series": SeriesFixed, "frame": FrameFixed}
            try:
                cls = _STORER_MAP[pt]
            except KeyError as err:
                raise TypeError(
                    f"cannot properly create the storer for: [_STORER_MAP] [group->"
                    f"{group},value->{type(value)},format->{format}"
                ) from err
            return cls(self, group, encoding=encoding, errors=errors)

        # existing node (and must be a table)
        if tt is None:
            # if we are a writer, determine the tt
            if value is not None: