Set in Python is an unordered collection of items. Every item is unique in it. i.e., the set doesn’t allow duplicates.

This Python set exercise aims to help you to learn and practice set operations. All questions are tested on Python 3.

**Also Read**:

**This Python set exercise includes the following**: –

- It contains 10 questions on set operations, manipulations, and set functions.
- This coding exercise includes set assignments, programs and challenges.

When you complete each question, you get more familiar with the Python set. Let us know if you have any alternative solutions. It will help other developers.

**Use**Online Code Editor**to solve exercise questions**.- Read the
**complete guide on Python Sets**to solve this exercise.

## Table of contents

- Exercise 1: Add a list of elements to a set
- Exercise 2: Return a new set of identical items from two sets
- Exercise 3: Get Only unique items from two sets
- Exercise 4: Update the first set with items that don’t exist in the second set
- Exercise 5: Remove items from the set at once
- Exercise 6: Return a set of elements present in Set A or B, but not both
- Exercise 7: Check if two sets have any elements in common. If yes, display the common elements
- Exercise 8: Update set1 by adding items from set2, except common items
- Exercise 9: Remove items from set1 that are not common to both set1 and set2

### Exercise 1: Add a list of elements to a set

Given a Python list, Write a program to add all its elements into a given set.

**Given**:

```
sample_set = {"Yellow", "Orange", "Black"}
sample_list = ["Blue", "Green", "Red"]
```

**Expected output:**

**Note**: Set is unordered.

{'Green', 'Yellow', 'Black', 'Orange', 'Red', 'Blue'}

## Show Hint

Use the `update()`

method of a set.

## Show Solution

```
sample_set = {"Yellow", "Orange", "Black"}
sample_list = ["Blue", "Green", "Red"]
sample_set.update(sample_list)
print(sample_set)
```

### Exercise 2: Return a new set of identical items from two sets

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
```

**Expected output:**

{40, 50, 30}

## Show Hint

Use the `intersection()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
print(set1.intersection(set2))
```

### Exercise 3: Get Only unique items from two sets

Write a Python program to return a new set with unique items from both sets by removing duplicates.

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
```

**Expected output:**

{70, 40, 10, 50, 20, 60, 30}

**Note**: set is unordered so not necessary this will be the order of the item.

## Show Hint

Use the `union()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
print(set1.union(set2))
```

### Exercise 4: Update the first set with items that don’t exist in the second set

Given two Python sets, write a Python program to update the first set with items that exist only in the first set and not in the second set.

**Given**:

```
set1 = {10, 20, 30}
set2 = {20, 40, 50}
```

**Expected output:**

`set1 {10, 30}`

## Show Hint

Use the `difference_update()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30}
set2 = {20, 40, 50}
set1.difference_update(set2)
print(set1)
```

### Exercise 5: Remove items from the set at once

Write a Python program to remove items 10, 20, 30 from the following set at once.

**Given**:

`set1 = {10, 20, 30, 40, 50}`

**Expected output:**

`{40, 50}`

## Show Hint

Use the `difference_update()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set1.difference_update({10, 20, 30})
print(set1)
```

### Exercise 6: Return a set of elements present in Set A or B, but not both

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
```

**Expected output****:**

`{20, 70, 10, 60}`

## Show Hint

Use the `symmetric_difference()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
print(set1.symmetric_difference(set2))
```

### Exercise 7: Check if two sets have any elements in common. If yes, display the common elements

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {60, 70, 80, 90, 10}
```

**Expected output:**

Two sets have items in common {10}

## Show Hint

- Use the
`isdisjoint()`

method check if sets has a common elements - If above condition is true then use the
`intersection()`

method to display common elements

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {60, 70, 80, 90, 10}
if set1.isdisjoint(set2):
print("Two sets have no items in common")
else:
print("Two sets have items in common")
print(set1.intersection(set2))
```

### Exercise 8: Update set1 by adding items from set2, except common items

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
```

**Expected output:**

`{70, 10, 20, 60}`

## Show Hint

Use the `symmetric_difference_update()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
set1.symmetric_difference_update(set2)
print(set1)
```

### Exercise 9: Remove items from set1 that are not common to both set1 and set2

**Given**:

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
```

**Expected output:**

`{40, 50, 30}`

## Show Hint

Use the `intersection_update()`

method of a set.

## Show Solution

```
set1 = {10, 20, 30, 40, 50}
set2 = {30, 40, 50, 60, 70}
set1.intersection_update(set2)
print(set1)
```