How to keep only first 20 rows in DataFrame?

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How do I keep only first 20 rows in a DataFrame and export it to a new DataFrame variable? in one line

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  • first(df, 20) if you want to produce 20 or less rows (if data frame is shorter).
  • df[1:20, :] if you want to produce 20 rows or throw error if data frame is shorter.
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