Menu
×
   ❮     
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS R TYPESCRIPT ANGULAR GIT POSTGRESQL MONGODB ASP AI GO KOTLIN SASS VUE DSA GEN AI SCIPY AWS CYBERSECURITY DATA SCIENCE
     ❯   

Pandas DataFrame reindex() Method

❮ DataFrame Reference


Example

Change the row indexes of the DataFrame:

import pandas as pd

data = {
  "age": [50, 40, 30, 40],
  "qualified": [True, False, False, False]
}
idx = ["Sally", "Mary", "John", "Monica"]
df = pd.DataFrame(data, index=idx)

newidx = ["Robert", "Cindy", "Chloe", "Pete"]
newdf = df.reindex(newidx)
print(newdf)
Try it Yourself »

Definition and Usage

The reindex() method allows you to change the row indexes, and the columns labels.

;]

Note: The values are set to NaN if the new index is not the same as the old.


Syntax

dataframe.reindex(keys, method, copy, level, fill_value, limit, tolerance)

Parameters

The method, copy, level, fill_value, limit, tolerance parameters are keyword arguments.

Parameter Value Description
keys   Required. String or list containing row indexes or column labels
method None
'backfill'
'bfill'
'pad'
'ffill'
'nearest'
Optional, default None. Specifies the method to use when filling holes in the indexes. For increasing/decreasing indexes only.
copy True
False
Optional, default True. Whether to return a new object (a copy) when all the new indexes are the same as the old
level Number
Label
Optional
fill_value List of values Optional, default NaN. Specifies the value to use for missing values
limit Number Optional, default None.
tolerance   Optional

Return Value

A DataFrame with the result.

This function does NOT make changes to the original DataFrame object.


❮ DataFrame Reference

×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
sales@w3schools.com

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
help@w3schools.com

W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.

Copyright 1999-2024 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.