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Arik Chakma 274082fd77 feat: clean roadmap content and sync scripts (#10181) 
* refactor: clean to roadmap content

* refactor: move shared helpers into scripts/lib
2026-07-28 05:45:17 +06:00

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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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