Method test_rename

xarray/tests/test_dataset.py:3372–3415

(self)

        assert_equal(actual, orig)

    def test_rename(self) -> None:
        data = create_test_data()
        newnames = {
            "var1": "renamed_var1",
            "dim2": "renamed_dim2",
        }
        renamed = data.rename(newnames)

        variables = dict(data.variables)
        for nk, nv in newnames.items():
            variables[nv] = variables.pop(nk)

        for k, v in variables.items():
            dims = list(v.dims)
            for name, newname in newnames.items():
                if name in dims:
                    dims[dims.index(name)] = newname

            assert_equal(
                Variable(dims, v.values, v.attrs),
                renamed[k].variable.to_base_variable(),
            )
            assert v.encoding == renamed[k].encoding
            assert type(v) is type(renamed.variables[k])

        assert "var1" not in renamed
        assert "dim2" not in renamed

        with pytest.raises(ValueError, match=r"cannot rename 'not_a_var'"):
            data.rename({"not_a_var": "nada"})

        with pytest.raises(ValueError, match=r"'var1' conflicts"):
            data.rename({"var2": "var1"})

        # verify that we can rename a variable without accessing the data
        var1 = data["var1"]
        data["var1"] = (var1.dims, InaccessibleArray(var1.values))
        renamed = data.rename(newnames)
        with pytest.raises(UnexpectedDataAccess):
            _ = renamed["renamed_var1"].values

        # https://github.com/python/mypy/issues/10008
        renamed_kwargs = data.rename(**newnames)  # type: ignore[arg-type]
        assert_identical(renamed, renamed_kwargs)

    def test_rename_old_name(self) -> None:
        # regtest for GH1477