Joris Van den Bossche created ARROW-14732:
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Summary: [Python] Improve error message in compute functions when
passing wrong positional/keyword arguments
Key: ARROW-14732
URL: https://issues.apache.org/jira/browse/ARROW-14732
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Joris Van den Bossche
>From
>https://stackoverflow.com/questions/69990087/how-to-use-pyarrow-compute-is-in-function
Small example of the current error messages:
{code:python}
array1 = pa.array([1,2,3,4])
array2 = pa.array([1,4])
import pyarrow.compute as pc
# Using positional for value_set as well (the signature indicates with * that
this are keyword
# only arguments, but the error message is still confusing compared to plain
python
>>> pc.is_in(array1, array2)
ArrowInvalid: Function is_in accepts 1 arguments but attempted to look up
kernel(s) with 2
# Using keyword for the first argument (which is allowed in pure python
functions)
# gives confusing error message because it passes it to the options
>>> pc.is_in(values=array1,value_set=array2)
...
~/scipy/repos/arrow/python/pyarrow/_compute.pyx in
pyarrow._compute.SetLookupOptions.__init__()
TypeError: __init__() got an unexpected keyword argument 'values'
{code}
I think it should be quite easy to improve the error messaging on this front,
since we know how many arguments the kernel takes.
cc [~amol-]
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