Arik Chakma
274082fd77
* refactor: clean to roadmap content * refactor: move shared helpers into scripts/lib
805 B
805 B
isnull, isna
isnull() and isna() are equivalent Pandas methods that return a boolean DataFrame or Series indicating which values are missing (NaN). They are the first step in assessing data completeness. Combined with .sum(), they give a count of missing values per column, and with boolean indexing they select rows with missing data.
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