isnull, isna
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What is 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.
Free resources to learn isnull, isna
- Official docsWorking with missing data
- Official docspandas.isnull
- Official docspandas.isna
- ArticleHandling Missing Values with Pandas
More in stage 9: Data Cleaning
isnull, isna: common questions
Can I learn isnull, isna in Hindi?
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Is this isnull, isna tutorial for beginners?
It is lesson 64 of 112 in the free Python for Data Analysis roadmap, in stage 9, Data Cleaning. If you are new to Python for Data Analysis, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.