15 Python Dictionary Exercises and Examples


In Python, we use dictionaries to store data in the form of key-value pairs. You can find the value from the dictionary by searching for the key.

The syntax of dictionaries is as follows:

{ key1: value1, key2 : value2, … }

In this post, I have added some simple examples of using dictionaries in Python. You can check out these examples to understand the working of dictionaries in various scenarios. Let’s dive right in.

Example of a dictionary in Python

alphabetDict = {
    "a":"apple",
    "b" :"ball",
    "c":"cat",
    "d":"doll"
}

print(alphabetDict)

2. Python Dictionary with duplicate items

In Python, dictionaries do not allow duplicate keys.

num_dict = {
    1:11,2:22,2:22,3:33,3:33,3:33
}

print(num_dict)

Python dictionaries allow duplicate values.

num_dict = {
    1:11,2:22,3:22,4:33,5:33,6:33
}

print(num_dict)

3. Clearing all keys and values in a Python dictionary

clearDict = {1:"python",2:"csharp",3:"php"}

print("Before clearing the dictionary:",clearDict)

clearDict.clear()

print("After clearing the dictionary:",clearDict)

4. Getting the value from a Python dictionary based on the key

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

#if value exists, it returns the value
print(programmingLangauges.get(1))

#if value doesn't exist, it returns None
print(programmingLangauges.get(4))

5. Getting the keys and values from a dictionary using items() method

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

print(programmingLangauges.items())

6. Getting the keys from a dictionary using keys() method

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

print(programmingLangauges.keys())

7. Getting the keys from a dictionary using values() method

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

print(programmingLangauges.values())

8. Popping out items from a Python dictionary using pop() method

The method pop(key) removes the key from the dictionary and returns its value.

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

print(programmingLangauges.pop(3))

print(programmingLangauges)

9. Converting two lists to a dictionary in Python

letters = ['a','b','c','d']
numbers = [1,2,3,4]

myDict = dict(zip(letters,numbers))
print(myDict)

10. Deleting elements from a dictionary using del

programmingLangauges = {1:"Python",2:"CSharp",3:"PHP"}

if 3 in programmingLangauges:
     del programmingLangauges[3]

print(programmingLangauges)

11. Sorting elements in a Python dictionary

programmingLangauges = {1:"Python",5:"Java",3:"PHP"}

for key in sorted(programmingLangauges):
    print(key,programmingLangauges[key])

12. Finding the sum of all values in a Python dictionary

myDict = {"n1":100,"n2":200,"n3":300}
print(sum(myDict.values()))

13. Example of the fromkeys() method in Python

In Python, the fromkeys() method returns a dictionary with the specified keys and the specified value.

p = ("p1","p2","p3")
q = 5

myDict = dict.fromkeys(p,q)
print(myDict)

14. Finding the min and max of values in a Python dictionary

myDict = {"n1":100,"n2":200,"n3":300}

print(max(myDict.values()))
print(min(myDict.values()))

15. Python dictionary of square of numbers

squareDict ={}

for i in range(1,6):
    squareDict[i] = i**2 
print(squareDict)

Ashwin Joy

I'm the face behind Pythonista Planet. I learned my first programming language back in 2015. Ever since then, I've been learning programming and immersing myself in technology. On this site, I share everything that I've learned about computer programming.

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