Python Dictionary Tutorial – Syntax, Examples, and Methods Boost Your Python Skills With Best Guide 2025

👉Python Dictionary Tutorial with Syntax & Examples

👉What is a Dictionary in Python?

Python Dictionary Tutorial : is an unordered, changeable collection of data that stores key-value pairs. Each key maps to a corresponding value, making data retrieval efficient. Dictionaries are defined using curly braces {} and contain comma-separated key-value pairs.

👉Key Characteristics of Python Dictionary

Python Dictionary Tutorial

• Keys: Unique and immutable (e.g., numbers, strings, tuples).
• Values: Can be any data type like lists, numbers, or nested lists.
• Case-Sensitive: Keys with different cases are treated uniquely.

👉Python Dictionary Tutorial Syntax

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}

print(Dict[‘Tiffany’])

Output: 22

👉Key Python Dictionary Methods

👉1. Copying a Dictionary

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

Boys = {‘Tim’: 18, ‘Charlie’: 12, ‘Robert’: 25}  

Girls = {‘Tiffany’: 22}  

studentX = Boys.copy()  

studentY = Girls.copy()  

print(studentX)  

print(studentY)

👉2. Updating a Dictionary

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

Dict.update({‘Sarah’: 9})  

print(Dict)

Output: {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25, ‘Sarah’: 9}

👉3. Deleting Dictionary Elements

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

del Dict[‘Charlie’]  

print(Dict)

Output: {‘Tim’: 18, ‘Tiffany’: 22, ‘Robert’: 25}

👉4. Dictionary items() Method

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

print(list(Dict.items()))

Output: [(‘Tim’, 18), (‘Charlie’, 12), (‘Tiffany’, 22), (‘Robert’, 25)]

👉5. Checking Key Existence in a Dictionary

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

Boys = {‘Tim’: 18, ‘Charlie’: 12, ‘Robert’: 25}  

for key in Boys.keys():

    if key in Dict.keys():

        print(True)

    else:

        print(False)

👉6. Sorting a Dictionary

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

Students = list(Dict.keys())  

Students.sort()  

for S in Students:

    print(f”{S}: {Dict[S]}”)

👉7. Dictionary len() Method

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

print(len(Dict))

Output: 4

👉8. Converting Dictionary to String

Dict = {‘Tim’: 18, ‘Charlie’: 12, ‘Tiffany’: 22, ‘Robert’: 25}  

print(str(Dict))

👉9. Merging Dictionaries with update() Method

my_dict1 = {‘username’: ‘XYZ’, ’email’: ‘xyz@gmail.com’, ‘location’: ‘Mumbai’}  

my_dict2 = {‘firstName’: ‘Nick’, ‘lastName’: ‘Price’}  

my_dict1.update(my_dict2)  

print(my_dict1)

Output: {‘username’: ‘XYZ’, ’email’: ‘xyz@gmail.com’, ‘location’: ‘Mumbai’, ‘firstName’: ‘Nick’, ‘lastName’: ‘Price’}

Python Tuple Tutorial