Ordering

>>> df = pd.DataFrame({"City": ["Paris", "Berlin", "London", "Amsterdam"]})
>>> table = session.read_pandas(df, keys={"City"}, table_name="Example")
>>> cube = session.create_cube(table)
>>> l, m = cube.levels, cube.measures

>>> l["City"].ordering = tt.Ordering(direction="ascending")
>>> cube.query(m["contributors.COUNT"], levels=[l["City"]]).index.tolist()
['Amsterdam', 'Berlin', 'London', 'Paris']

>>> l["City"].ordering = tt.Ordering(direction="descending")
>>> cube.query(m["contributors.COUNT"], levels=[l["City"]]).index.tolist()
['Paris', 'London', 'Berlin', 'Amsterdam']

>>> l["City"].ordering = tt.Ordering(first=["Paris", "London"])
>>> cube.query(m["contributors.COUNT"], levels=[l["City"]]).index.tolist()
['Paris', 'London', 'Amsterdam', 'Berlin']

>>> tt.Ordering(direction="descending", first=["Paris"])
Traceback (most recent call last):
    ...
NotImplementedError: `first` cannot be combined with a non default `direction` or `string_comparison` yet.