---
title: "What is Set Comprehension in Python? How to Use it"
description: "Here are the key features that you need to know about Python set comprehension."
url: https://srinimf.com/2022/05/02/what-is-set-comprehension-in-python-how-to-use-it/
date: 2022-05-02
modified: 2026-10-10
author: "Srini"
image: https://i0.wp.com/srinimf.com/wp-content/uploads/2022/05/pexels-photo-209004.jpeg?fit=1880%2C1058&ssl=1
categories: ["Python"]
type: post
lang: en
---

# What is Set Comprehension in Python? How to Use it

Here is all about Set comprehension in Python and [how to](https://srinimf.com/2021/12/04/python-program-to-spell-out-number/) use it. In Python, you can simplify the code using comprehension.

## **Here’s all about Set comprehensions**

**Before you deep dive into set comprehension, learn these:**

- you can’t modify an existing set with comprehension,
- you can only create a new one.
- the comprehension must result in a valid set.
- A set cannot contain multiple entries of the same value( duplicates are not allowed).

### **1. How the data looks like in Set**

Like the dictionary, Python is polite about this. If you try to add values to the set that are already there, it will replace the old one with the new one.

Related[3 Ways to Convert Python Dictionary into JSON Format](https://srinimf.com/2023/07/10/python-methods-to-format-dictionary-to-json-quickly/)

#### **Syntax for Set comprehension**

***{expression(variable) for variable in input_set [predicate]\[, …]}***

Related[SQL Query to Remove, get Only Duplicates](https://srinimf.com/2015/12/22/best-db2-sql-queries-to-work-on-duplicate-values/)

With set comprehension, you can eliminate duplicates. In fact, this is one of the most basic uses of set comprehension.

### **2. [How to](https://srinimf.com/2015/05/27/reduce-sql-complexity-with-grouping-sets-in-db2-v11/) work with Set comprehension**

Given a list, we can duplicate it as a list with a simple list comprehension like this:

```
l_copy =
```

If we change the list comprehension to a set comprehension, we get the same result, but as a **set**:

```
my_list_dupes = [5,5,7,8,9,3,4,1,2,3,4,5,6,7,1,2,3]
my_set_wo_dupes = {x for x in my_list_dupes}
print(my_set_wo_dupes)

{1, 2, 3, 4, 5, 6, 7, 8, 9}


** Process exited - Return Code: 0 **
Press Enter to exit terminal
```

References

- [Python for professionals](https://www.amazon.in/Python-Professionals-Hands-Guide-English-ebook/dp/B082WDWBS4?tag=srinimf-21)

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