[Python] How to filter empty strings from a list column of Python Polars Dataframe?

I have a python polars dataframe as-

df_pol = pl.DataFrame({'test_names':[['Mallesham','','Bhavik','Jagarini','Jose','Fernando'],
['','','','ABC','','XYZ']]})


I would like to get a count of elements from each list in test_names field not considering the empty values.

df_pol.with_columns(pl.col('test_names').list.len().alias('tot_names'))




Here it is considering empty strings into count, this is why we can see 6 names in list-2. actually it has only two names.

required output as:



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