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DataFrame.duplicated(subset=None, keep='first')[source]

Return boolean Series denoting duplicate rows, optionally only considering certain columns


subset : column label or sequence of labels, optional

Only consider certain columns for identifying duplicates, by default use all of the columns

keep : {‘first’, ‘last’, False}, default ‘first’

  • first : Mark duplicates as True except for the first occurrence.
  • last : Mark duplicates as True except for the last occurrence.
  • False : Mark all duplicates as True.

duplicated : Series

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