python xarray - groupby.apply method taking more than one arguments -

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in xarray document, groupby.apply method can apply function different groups. in documentation, 

in [11]: def standardize(x):    ....:     return (x - x.mean()) / x.std()    ....:   in [12]: arr.groupby('letters').apply(standardize)

however, how can put argument standardize function? i.e.

 def standardize(x, y):    ....:     return (x - x.mean()) / x.std() + y.sum() arr.groupby('letters').apply(standardize(x, y))??

it obvious not right. now, there no way call apply method.

to apply operation on multiple variables @ once, put multiple dataarray objects single xarray.dataset, e.g.,

# foo , bar xarray.dataarray objects ds = xarray.dataset({'x': foo, 'y': bar})  def standardize(ds):     return (ds.x - ds.x.mean()) / ds.x.std() + ds.y.sum()  ds.groupby('letters').apply(standardize)

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