issue_comments: 594670062

not sure if you really should use accessors to do that; having a function return a wrapper object might be enough.

Then again, an accessor is a slightly modified version of a property so you can just make your object callable by defining __call__: ```python @xr.register_dataarray_accessor("weighted") class Weighted: def init(self, xarray_obj): self._obj = xarray_obj self._weight = None

def __call__(self, weight):
    self._weight = weight

def sum(self, dim):
    return "weighted sum"

this does allow calling `obj.weighted.sum(dim)`, so instead you can use:python In [2]: class Weighted: ...: def init(self, obj, weight): ...: self._obj = obj ...: self._weight = weight ...:
...: def sum(self, dim): ...: return f"weighted sum over {dim} and with weight {self._weight}" ...:
...: @xr.register_dataarray_accessor("weighted") ...: def weighted(obj): ...: def wrapped(weight): ...: return Weighted(obj, weight) ...: return wrapped ...:
...: da = xr.DataArray(data=range(5), dims="x") ...: da.weighted(5).sum(dim="x") Out[2]: 'weighted sum over x and with weight 5' ```

Edit: the warning about a overridden attribute was the result of rerunning the code without restarting the interpreter