#cleaning

Pandas Easy Theory

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How do you handle missing data in pandas?

Inspect null patterns first, then choose to drop, fill, or flag them based on meaning.

• Use isna to inspect
• fillna or dropna depending on business meaning
• Missingness itself can be informative

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How do you handle missing data in pandas?

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Pandas Medium Theory

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What causes SettingWithCopyWarning in pandas?

It happens when pandas is unsure whether you are writing to a view or a detached copy.

• Chained indexing is the common trigger
• Use loc for assignment
• Make copies explicit when needed

#cleaning #indexing #pandas

What causes SettingWithCopyWarning in pandas?

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