DeprecationWarning has unclear origin: `should_run_async` will not call `transform_cell` automatically in the future

[courtarro]

This deprecation appears when I have warnings enabled, as of some time within the past week or so, and it is unclear what its origin is. How would I go about finding what component is causing this warning to appear?

For the record, the following code causes the problem to appear:

import warnings
import pandas as pd
warnings.simplefilter('always')
pd.read_csv('filename.csv')

I could turn off warnings, obviously, but I need them for other situations. Hiding the issue doesn't really fix it, of course. I have the standard contrib notebook extensions installed also.

[Carreau]

Sorry those are just internal APIs.I transfered this issue to IPykernel repository.

[lingyunfeng]

me too

[lingyunfeng]

print ('hello')
hello
/usr/local/miconda3/envs/py37/lib/python3.7/site-packages/ipykernel/ipkernel.py:287: DeprecationWarning: should_run_async will not call transform_cell automatically in the future. Please pass the result to transformed_cell argument and any exception that happen during thetransform in preprocessing_exc_tuple in IPython 7.17 and above.
and should_run_async(code)

[lingyunfeng]

I Find a idea to this problem.

change ipkernel.py:287 line code :
#and should_run_async(code)
and should_run_async(code,transformed_cell=code)
@courtarro @Carreau

[Carreau]

and should_run_async(code,transformed_cell=code)

no, that is wrong, that will break many of the magics and specific IPython syntax.

[Carreau]

look at how IPython is doing it:

preprocessing_exc_tuple = None
        try:
            transformed_cell = self.transform_cell(raw_cell)
        except Exception:
            transformed_cell = raw_cell
            preprocessing_exc_tuple = sys.exc_info()

        ...
        elif self.should_run_async(
            raw_cell,
            transformed_cell=transformed_cell,
            preprocessing_exc_tuple=preprocessing_exc_tuple,
        ):
            ...

[lingyunfeng]

so ,I can only use 'warnings' function.
import warnings
warnings.simplefilter('once')#"error", "ignore", "always", "default", "module"

[hellodanylo]

Another workaround is to downgrade IPython to 7.10 until this issue is resolved in IPyKernel