UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Learn Python Training from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Python > Learn Python > What is __contains__() in Python?
✕

Search in

What is __contains__() in Python?

Asked by Last Modified  

3 Answers

Learn Python

Follow 2
Answer

Please enter your answer

Empowering Python learners with practical expertise.

__contains__() is a special method in Python that allows an object to define its own behavior when it is checked for containment in another object using the in keyword. The method should return True if the object contains the given value, and False otherwise. Here's an example that demonstrates how...
read more
__contains__() is a special method in Python that allows an object to define its own behavior when it is checked for containment in another object using the in keyword. The method should return True if the object contains the given value, and False otherwise. Here's an example that demonstrates how to use __contains__(): class MyList: def __init__(self, values): self.values = values def __contains__(self, value): return value in self.values my_list = MyList([1, 2, 3, 4, 5]) print(3 in my_list) # output: Trueprint(6 in my_list) # output: False In this example, the MyList class defines its own behavior for the in keyword by implementing the __contains__() method. The method simply checks whether the given value is in the values list and returns True or False accordingly. Note that __contains__() can be implemented for any custom object type in Python, and is often used for container types such as lists, sets, and dictionaries. read less
Comments
Dislike Bookmark

Research Engineer with 20+years experience

__contains__() is a special method in Python that allows objects to define custom behavior for the in operator. The in operator is used to test if a value is a member of a sequence or a collection. When an object defines the __contains__() method, it can be used with the in operator to determine if...
read more
__contains__() is a special method in Python that allows objects to define custom behavior for the in operator. The in operator is used to test if a value is a member of a sequence or a collection. When an object defines the __contains__() method, it can be used with the in operator to determine if a given value is contained within the object. The __contains__() method should return True if the value is present in the object, and False otherwise. Here's an example of how __contains__() can be used: class MyList: def __init__(self, data): self.data = data def __contains__(self, value): return value in self.data my_list = MyList([1, 2, 3, 4, 5]) print(3 in my_list) # Output: Trueprint(6 in my_list) # Output: False read less
Comments
Dislike Bookmark

IT Professional Trainer with 14 years of Experience

In Python, the __contains__() method is a special method that allows objects to define their own behavior when used with the in operator. It is called by the in operator to check if a given value is present in the object. The __contains__() method takes two parameters: self (representing the object...
read more
In Python, the __contains__() method is a special method that allows objects to define their own behavior when used with the in operator. It is called by the in operator to check if a given value is present in the object. The __contains__() method takes two parameters: self (representing the object itself) and item (representing the value being checked). It should return True if the item is found in the object, and False otherwise. Here's an example to illustrate the usage of __contains__() method: class MyList: def __init__(self, items): self.items = items def __contains__(self, item): return item in self.items my_list = MyList([1, 2, 3, 4, 5]) print(3 in my_list) # Output: Trueprint(6 in my_list) # Output: False In this example, we define a custom class MyList that wraps a list of items. The __contains__() method is implemented to check if an item is present in the list by using the in operator on the self.items attribute. By implementing the __contains__() method, objects of the MyList class can now be used with the in operator to check for membership of a specific value in the list. Note that if the __contains__() method is not defined for an object, Python falls back to other methods to determine the containment. For example, it checks if the object has an __iter__() method and uses it to iterate over the elements, or it checks if the object has a __getitem__() method to access the elements by index. read less
Comments
Dislike Bookmark

View 1 more Answers

Related Questions

What are good books on advanced topics in Python?
Here are some good books on advanced topics in Python: 1. **"Fluent Python" by Luciano Ramalho**: Focuses on Python’s advanced features and best practices.2. **"Effective Python: 90 Specific Ways...
Vinodha
0 0
5
How many months it takes to learn Python good enough to get a job?
Ideally, it would take up to 2 months to learn Python good enough to get a job. However, it varies depending on the educational level of the student and how much hours the student is willing to put in per day.
Gene
0 0
5
Can anyone help me with the below programs: A) which returns orger summary as a list with 2- tuples. Each tuple consists of the order number and the product of the price per items and the quantity. OUTPUT: [ ('34587',163.8),('98762',284.0),('77226',98.85),('88112',74.97) ]. 10 INR should be increased in the product if the value of the order is smaller than 100.00 INR. OUTPUT: [ ('34587',163.8),('98762',284.0),(77226',108.85),('88112',84.97) ]
Can't solve because product price is a part of the tuple. Since LIST IS MUTABLE so we can change its elements. We can change the whole tuple because it is an element of the list. As WKT TUPLE IS IMMUTABLE so we can't change its elements.
Anurag
Hi, can anyone tell me where I can learn more and be professionally guided on 1-1 basis , on Machine Learning and Deep learning using Python? I already have statistics and programming background
I would first recommend taking some good Linear Algebra course, you would need some intuitive understanding about concepts like linear leas squares, singular value decomposition, normal equations,etc....
Ravi
0 0
5
What are the best websites to learn Python from beginner level?
There are tonnes of Python learning platforms for free, and some good online couse with low cost < $10. Kindly check Udemy as well. But my recomandation is go with online instructor based class which...
Tushar
0 0
9

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Python Introduction

Kevin Joseph k

0 0
0
Using Lambda and Filter with Regular expressions.
1) Start the Python interpreter and import the re module: >>> import re 2)Define a tuple strings to filter with regular expressions: t=('python','pycon','perl','peril','step','stop','come','came','exercise','hello','storm','my.mail','year','yam') ...

Michael Devine

0 0
0
Write your first Python program in 10 minutes
1. Download python from python official site search "python download" in google 2. Install in your machine 3. verify using : "python --version" command 4. Write first program using notepad create...

Debrati Sadhu

1 0
0
The Zen of Python
Writing programs that actually do what they are supposed to do is just one component of being a good python programmer. It's also important to write clean code that is easily understood, even weeks after...

Sudheer S

0 0
0
Why Do People Choose Python?
Lot of programming languages are available in the market today, but why do people choose python over them? What made it different from other scirpting languages. So factors made it unique, as below: Software...

Venu

0 0
0

Recommended Articles

Top 5 reasons why you should learn Python

Python is one of the most popular programming languages in the world. It is general-purpose, object oriented, high-level programming language used in a number of programming fields. Python is a great programming language to learn as it will introduce you to the world of programming. If you are from the technical background...

Read full article >

Why Should you Become an IT Consultant

Information technology consultancy or Information technology consulting is a specialized field in which one can set their focus on providing advisory services to business firms on finding ways to use innovations in information technology to further their business and meet the objectives of the business. Not only does...

Read full article >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

Read full article >

Learn Microsoft Excel

Microsoft Excel is an electronic spreadsheet tool which is commonly used for financial and statistical data processing. It has been developed by Microsoft and forms a major component of the widely used Microsoft Office. From individual users to the top IT companies, Excel is used worldwide. Excel is one of the most important...

Read full article >

Find Python Training classes near you
Python Training classes in Bangalore
Python Training classes in Hyderabad
Python Training classes in Chennai
Python Training classes in Delhi
Python Training classes in Mumbai
Python Training classes in Pune
Python Training classes in Noida
Python Training classes in Kolkata
Python Training classes in Gurgaon
Python Training classes in Lucknow
Online Python Training

Looking for Python Training classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Python Training Classes?

The best tutors for Python Training Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn Python Training with the Best Tutors

The best Tutors for Python Training Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2025 All Rights Reserved