Python

df_test.iloc[0]
or
df_test['someColumnName'].iloc[0]

df2 = df.head(N)
# this should select N rows from top and copy to new df
df3 = df.tail(N)
# this should select N rows from bottom and copy to new df

 df.iloc[:n]

DataFrame.head( n = 5)

df.head(n)

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