atoti.switch()#

atoti.switch(subject, cases, /, *, default=None)#

Return a measure equal to the value of the first case for which subject is equal to the case’s key.

cases’s values and default must either be all numerical, all boolean or all objects.

Parameters:

subject (VariableMeasureConvertible) – The measure or level to compare to cases’ keys.
cases (Mapping[MeasureConvertible | None | AbstractSet[MeasureConvertible | None], MeasureConvertible]) – A mapping from keys to compare with subject to the values to return if the comparison is True.
default (MeasureConvertible | None) – The measure to use when none of the cases matched.

Return type:

MeasureDescription

Example

>>> df = pd.DataFrame(
...     columns=["Id", "City", "Value"],
...     data=[
...         (0, "Paris", 1.0),
...         (1, "Paris", 2.0),
...         (2, "London", 3.0),
...         (3, "London", 4.0),
...         (4, "Paris", 5.0),
...         (5, "Singapore", 7.0),
...         (6, "NYC", 2.0),
...     ],
... )
>>> table = session.read_pandas(df, keys={"Id"}, table_name="Switch example")
>>> cube = session.create_cube(table)
>>> l, m = cube.levels, cube.measures
>>> m["Continent"] = tt.switch(
...     l["City"],
...     {
...         frozenset({"Paris", "London"}): "Europe",
...         "Singapore": "Asia",
...         "NYC": "North America",
...     },
... )
>>> cube.query(m["Continent"], levels=[l["City"]])
               Continent
City
London            Europe
NYC        North America
Paris             Europe
Singapore           Asia
>>> m["Europe & Asia value"] = tt.agg.sum(
...     tt.switch(
...         m["Continent"],
...         {frozenset({"Europe", "Asia"}): m["Value.SUM"]},
...         default=0.0,
...     ),
...     scope=tt.OriginScope({l["Id"], l["City"]}),
... )
>>> cube.query(m["Europe & Asia value"], levels=[l["City"]])
          Europe & Asia value
City
London                   7.00
NYC                       .00
Paris                    8.00
Singapore                7.00
>>> cube.query(m["Europe & Asia value"])
  Europe & Asia value
0               22.00