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Pandas · Concept

Copy-on-Write

Copy-on-Write makes derived pandas DataFrames and Series behave like copies. pandas delays copying until a write needs to protect shared data, which can reduce unnecessary memory work.

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  • Copy-on-Write
  • BlockValuesRefs
  • Block
  • DataFrame
  • Series

Source: Copy on write — pandas 3.2.0.dev0 documentation. Checked 2026-11-03.