AttributeError: 'Series' object has no attribute 'std'

[skrawcz]

Is this expected behavior?

Repro:

import dask_expr as dx
df = dx.datasets.timeseries(dtypes={"name": "string", "id": int, "quantity": int, "spend": float})
df["quantity"].std()

Stacktrace:

Traceback (most recent call last):
  File "lib/python3.9/site-packages/dask_expr/_collection.py", line 175, in __getattr__
    val = getattr(self.expr, key)
  File "lib/python3.9/site-packages/dask_expr/_expr.py", line 148, in __getattr__
    raise err
  File "lib/python3.9/site-packages/dask_expr/_expr.py", line 137, in __getattr__
    return object.__getattribute__(self, key)
AttributeError: 'Projection' object has no attribute 'std'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "lib/python3.9/site-packages/dask_expr/_collection.py", line 181, in __getattr__
    raise err
  File "lib/python3.9/site-packages/dask_expr/_collection.py", line 170, in __getattr__
    return object.__getattribute__(self, key)
AttributeError: 'Series' object has no attribute 'std'

[phofl]

Hi, thanks for your report and thanks for trying dask-expr!

std isn't implemented yet since it goes through dask.array code that we don't support yet. So for now this is the expected behaviour. Sorry.

Edit: Same vor var

[mrocklin]

Maybe we should implement the numerically unstable algorithm instead as a stopgap?

…

On Thu, Jul 20, 2023 at 4:54 AM Patrick Hoefler ***@***.***> wrote: Hi, thanks for your report and thanks for trying dask-expr! std isn't implemented yet since it goes through dask.array code that we don't support yet. So for now this is the expected behaviour. Sorry. — Reply to this email directly, view it on GitHub <#233 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACKZTA5HY5JIX2MYAUSRR3XRDW4HANCNFSM6AAAAAA2Q247NU> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[skrawcz]

No worries. Is there a list of supported APIs somewhere?

[rjzamora]

No worries. Is there a list of supported APIs somewhere?

Good call. Now that people are using dask-expr, we definitely need this kind of documentation (I opened #234 to track this)

[skrawcz]

No worries. Is there a list of supported APIs somewhere?

Good call. Now that people are using dask-expr, we definitely need this kind of documentation (I opened #234 to track this)

Sweet, thanks. It'd be nice if the error experience could discern/guess the situation and point people to that list :)

[phofl]

Pushed out a new release that contains std and var among other things.