Python for Data Analysis: Step-By-Step with Projects - Sorting Data

This video tutorial covers sorting data frames in pandas using the sort_values method. It explains how to sort by single or multiple columns in both ascending and descending order. The tutorial also introduces the nlargest and nsmallest methods for efficiently retrieving the largest or smallest values in numeric columns. Practical examples are provided to demonstrate these techniques.

What is the default sorting order when using the sort_values method in pandas?

• Ascending

• Random

• Descending

• None

How can you sort a DataFrame by a text column in reverse alphabetical order?

• Set ascending parameter to false

• Use the nsmallest method

• Set ascending parameter to true

• Use the nlargest method

How can you sort a DataFrame by BMI in descending order?

• Use nlargest method

• Use nsmallest method

• Use sort_values with ascending set to false

• Use sort_values with ascending set to true

When sorting by multiple columns, what determines the primary sorting column?

• The first column listed in the by argument

• The column with the most unique values

• The column with the smallest values

• The column with the largest values

What is the result of sorting a DataFrame by race and then by height?

• Data is sorted randomly

• Data is sorted by race first, then height

• Data is sorted by height first, then race

• Data is not sorted

Which method is more efficient for retrieving the top N largest values in a numeric column?

• nlargest

• sort_index

• sort_values

• nsmallest

Which method would you use to find the smallest values in a numeric column?

• nsmallest

• nlargest

• sort_values

• sort_index

Which method is more efficient for retrieving the smallest values in a numeric column?

• nsmallest

• sort_values

• sort_index

• nlargest

What happens if you use nlargest on a column with string data type?

• It converts strings to numbers

• It returns an empty DataFrame

• It throws an error

• It returns the largest strings alphabetically

What is a potential issue when using nsmallest on a column with missing data?

• It may include negative values

• It sorts alphabetically

• It throws an error

• It returns incorrect values