Reverse values in a polars dataframe

reverse

Polars allows you to reverse the values in your dataframe so that the last row becomes the first. Below is a dataframe showing the itinerary of a businessperson like yourself.

shape: (4, 2)

Itinerary	Date
str	str
"Los Angeles"	"2025-05-01"
"Syndney"	"2025-05-15"
"Wellington"	"2025-06-02"
"Tokio"	"2025-06-17"

Reverse values

Suppose you realize that your final destination is Los Angeles, not Tokyo. How can you reverse the values in the dataframe? You can use the reverse method like this:

(df
 .reverse()
 )

shape: (4, 2)

Itinerary	Date
str	str
"Tokio"	"2025-06-17"
"Wellington"	"2025-06-02"
"Syndney"	"2025-05-15"
"Los Angeles"	"2025-05-01"

Caution

I know that reversing in this context doesn’t make much sense because the dates won’t be chronological. I’m merely demonstrating how to reverse values in a dataframe.

Learn even more Polars tricks from my Polars course.