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# Python Set

A Python set is an unordered collection of distinct elements. Set is unordered means elements in the set can appear in random order. Sets are written using {} curly brackets.

## The basic example of Set

``` #Create a Set languages = {'C', 'C++', 'Java'} print(type(languages)) print(languages) # Check if an element is a member of the set print('C' in languages) print('Python' in languages) # Add an element in a set languages.add('Python') print(languages) # Remove an element from the set languages.remove('Java') print(languages) ```

Try to execute the code. You notice elements in the set will be displayed in random order.

## Looping through Set

Looping through a set also displays elements in random order. Whereas, looping through lists displays elements in the same order.

Loop through Set

``` print('*********** Looping throug a Set - Order is NOT maintained - UNORDERED ************') languages = {'C', 'C++', 'Java'} for indx, x in enumerate(languages): print(indx, x) ```

Loop through List

``` print('*********** Looping throug a List - Order is maintained ***************') languages = ['C', 'C++', 'Java'] for indx, x in enumerate(languages): print('%d %s' % (indx, x)) ```

## Set Comprehension

Python Set comprehension allows us to construct the dictionary easily. In this example, we will find the square root of numbers in range 10 using set comprehension.

``` from math import sqrt print('*********** Set Comprehension - Repeated elements are NOT ALLOWED ************') nums_sqrt_set = {int(sqrt(x)) for x in range(10)} print(nums_sqrt_set) ```

## Using List Comprehension

If we run sample example of finding a square root in range 10 using List Comprehension, you see repeated elements are allowed.
``` from math import sqrt print('*********** List Comprehension - Repeated elements are ALLOWED ***************') nums_sqrt_list = [int(sqrt(x)) for x in range(10)] print(nums_sqrt_list) ```

You may notice the difference between List Comprehension and Set Comprehension. Set Comprehension uses {int(sqrt(x)) for x in range(10)} (curly brackets)

Whereas,

List Comprehension uses [int(sqrt(x)) for x in range(10)](square brackets).

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