Assign new data variables to a Dataset, returning a new object with all the original variables in addition to the new ones.
kwargs : keyword, value pairs
keywords are the variables names. If the values are callable, they are computed on the Dataset and assigned to new data variables. If the values are not callable, (e.g. a DataArray, scalar, or array), they are simply assigned.
ds : Dataset
A new Dataset with the new variables in addition to all the existing variables.
Since kwargs is a dictionary, the order of your arguments may not be preserved, and so the order of the new variables is not well defined. Assigning multiple variables within the same assign is possible, but you cannot reference other variables created within the same assign call.