sort_index() for index sorting in Pandas - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the sort_index() function do in pandas?

The sort_index() function sorts a DataFrame or Series by its index labels in ascending or descending order.

beginner

How do you sort a DataFrame by its index in descending order using sort_index()?

Use df.sort_index(ascending=False) to sort the DataFrame's index from highest to lowest.

intermediate

What parameter in sort_index() controls whether the sorting is done in place or returns a new object?

The inplace parameter. If inplace=True, the original DataFrame or Series is modified. Otherwise, a sorted copy is returned.

intermediate

Can sort_index() sort by multiple index levels in a MultiIndex DataFrame?

Yes. By default, it sorts by all index levels. You can also specify which level(s) to sort using the level parameter.

beginner

What is the default sorting order of sort_index()?

The default is ascending order (ascending=True).

What does df.sort_index() do by default?

A Sorts the DataFrame by its columns in ascending order

B Removes duplicate index labels

C Sorts the DataFrame by its values in descending order

D Sorts the DataFrame by its index in ascending order

By default, sort_index() sorts the DataFrame by its index labels in ascending order.

How do you sort a DataFrame's index in descending order?

A df.sort_index(ascending=False)

B df.sort_index(descending=True)

C df.sort_values(ascending=False)

D df.sort_index(ascending=True)

Use ascending=False to sort the index in descending order.

Which parameter lets you sort a MultiIndex DataFrame by a specific level?

A by

B level

C axis

D subset

The level parameter specifies which index level(s) to sort.

What happens if you set inplace=True in sort_index()?

A Sorts the DataFrame and modifies it directly

B Returns a new sorted DataFrame

C Raises an error

D Sorts columns instead of index

Setting inplace=True modifies the original DataFrame without returning a new one.

Which of these is NOT a valid use of sort_index()?

A Sorting a Series by its index

B Sorting a DataFrame by its index

C Sorting a DataFrame by column values

D Sorting a MultiIndex DataFrame by a specific level

sort_index() sorts by index, not by column values. Use sort_values() for column sorting.

Explain how to use sort_index() to sort a pandas DataFrame by its index in descending order and modify the original DataFrame.

Remember the parameters ascending and inplace.

Describe how sort_index() works with MultiIndex DataFrames and how to sort by a specific index level.

Think about the level parameter and default behavior.