If you want to quickly observe the brief statistics of a DataFrame object in the form shown below, please write the corresponding method name on the horizontal line   iris_df_length.________________() sepal length (cm) petal length (cm) count 150.000000 150.000000 mean 5.843333 3.758000 std 0.828066 1.765298 min 4.300000 1.000000 25% 5.100000 1.600000 50% 5.800000 4.350000 75% 6.400000 5.100000 max 7.900000 6.900000

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