Sorting by index in Pandas - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does sorting by index mean in pandas?

Sorting by index means arranging the rows or columns of a DataFrame or Series based on their index labels in ascending or descending order.

beginner

Which pandas method is used to sort a DataFrame by its index?

The method sort_index() is used to sort a DataFrame or Series by its index labels.

intermediate

How do you sort a DataFrame by its index in descending order?

Use df.sort_index(ascending=False) to sort the DataFrame by its index in descending order.

advanced

What happens if you use sort_index() on a DataFrame with a MultiIndex?

The sort_index() method sorts the DataFrame by all levels of the MultiIndex by default, arranging rows based on the hierarchical index labels.

intermediate

Can you sort columns by their index labels using sort_index()?

Yes, by setting the parameter axis=1 in sort_index(), you can sort the columns of a DataFrame by their index labels.

Which pandas method sorts a DataFrame by its index?

A sort_index()

B sort_values()

C order_by()

D index_sort()

The correct method to sort by index in pandas is sort_index().

How do you sort a DataFrame's columns by their index labels?

A df.sort_values(axis=1)

B df.sort_index(axis=0)

C df.sort_columns()

D df.sort_index(axis=1)

Setting axis=1 in sort_index() sorts the columns by their index labels.

What does df.sort_index(ascending=False) do?

A Sorts the DataFrame by index in descending order

B Sorts the DataFrame by values in descending order

C Sorts the DataFrame by columns in ascending order

D Sorts the DataFrame by index in ascending order

The parameter ascending=False sorts the index in descending order.

If a DataFrame has a MultiIndex, how does sort_index() behave by default?

A Sorts only the first level of the MultiIndex

B Sorts by all levels of the MultiIndex

C Does not sort MultiIndex DataFrames

D Sorts only the last level of the MultiIndex

By default, sort_index() sorts all levels of a MultiIndex.

What is the default sorting order of sort_index()?

A Random order

B Descending order

C Ascending order

D No sorting

The default sorting order for sort_index() is ascending.

Explain how to sort a pandas DataFrame by its index and how to change the sorting order.

Think about the method name and the parameter that controls ascending or descending.

Describe how to sort the columns of a DataFrame by their index labels.

Remember axis=0 is rows, axis=1 is columns.