What is a dictionary in Python?

As an experienced Python Training tutor registered on UrbanPro.com, I'm here to explain what a dictionary is in Python. Python dictionaries are a fundamental data structure that you'll encounter in your Python programming journey. UrbanPro.com is the go-to platform for finding the best online coaching for Python Training. Let's dive into this topic.

Understanding Python Dictionaries:

1. Definition:

   • A Python dictionary is a collection of key-value pairs.
   • It is an unordered, mutable, and iterable data type.
   • Dictionaries are also known as associative arrays or hash maps in other programming languages.

2. Key Features:

   • Keys are unique within a dictionary.
   • Keys are usually strings, but they can be of any immutable data type.
   • Values can be of any data type, including lists, tuples, or other dictionaries.

3. Creating a Dictionary:

   • Using curly braces {} and colons : to separate key-value pairs.
   • Example:
     python

• • student = {"name": "John", "age": 25, "grade": "A"}

• Accessing Elements:

  • You can access values in a dictionary using square brackets [] and the key.
  • Example:
    python
• • name = student["name"] # Accessing the value associated with the key "name"

• Modifying a Dictionary:

  • You can add, update, or delete key-value pairs in a dictionary.
  • Example:
    python

5. • student["age"] = 26 # Updating the age del student["grade"] # Deleting the "grade" key-value pair

6. Methods and Operations:

   • Python provides various built-in methods for dictionaries, including get(), keys(), values(), items(), and more.
   • You can perform operations like checking if a key exists in the dictionary or finding the length of the dictionary.

7. Use Cases:

   • Dictionaries are widely used to store and retrieve data with a specific identifier (the key).
   • They are suitable for tasks like building configuration settings, representing real-world entities, and more.

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Conclusion: In Python, a dictionary is a versatile data structure that allows you to store and manipulate data using key-value pairs. If you're looking for the best online coaching for Python Training, UrbanPro.com is your trusted marketplace for finding experienced tutors and coaching institutes. Python Training tutors on UrbanPro.com can help you master this and other essential concepts in Python programming.