Pandas DataFrame Semantics
A DataFrame is a dict of labeled columns sharing a row Index; operations align on labels, not positions, which silently introduces NaN when indexes disagree. Label-based (.loc) and positional (.iloc) indexing follow different rules, and chained indexing creates the view-vs-copy ambiguity that copy-on-write semantics now resolves.
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A DataFrame is a dict of labeled columns sharing a row Index; operations align on labels, not positions, which silently introduces NaN when indexes disagree. Label-based (.loc) and positional (.iloc) indexing follow different rules, and chained indexing creates the view-vs-copy ambiguity that copy-on-write semantics now resolves.
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