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 query() Method

❮ DataFrame Reference


Example

Return the rows where age is over 35:

import pandas as pd

data = {
  "name": ["Sally", "Mary", "John"],
  "age": [50, 40, 30]
}

df = pd.DataFrame(data)

print(df.query('age > 35'))
Try it Yourself »

Definition and Usage

The query() method allows you to query the DataFrame.

The query() method takes a query expression as a string parameter, which has to evaluate to either True of False.

It returns the DataFrame where the result is True according to the query expression.


Syntax

dataframe.query(expr, inplace)

Parameters

The inplace paramater is a keyword argument.

Parameter Values Description
expr Required. A string that represents a query expression.
inplace True|False Optional. A boolean value that specifies if the query() method should leave the original DataFrame untouched and return a copy (inplace = False). This is Default.
Or:
Make the changes in the original DataFrame (inplace = True)

Return Value

A DataFrame with the new result, or None if the changes were made in the original DataFrame (inplace = True).


❮ 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.