Dictionary Literals in Python

Dictionary literals are a concise way to create dictionaries in Python. They consist of a pair of curly braces {} enclosing a comma-separated list of key-value pairs.

Syntax:

Python

dictionary_name = {key1: value1, key2: value2, ...}

Example:

Python

person = {"name": "Alice", "age": 30, "city": "New York"}

Key Points:

• Keys must be unique within a dictionary.

• Values can be of any data type.

• Dictionary literals are immutable, meaning you cannot change the keys after creation.

Nested Dictionaries

You can create nested dictionaries by using dictionaries as values within other dictionaries:

Python

student_data = {

    "student1": {"name": "Alice", "age": 20},

    "student2": {"name": "Bob", "age": 22}

}

Empty Dictionaries

To create an empty dictionary, use empty curly braces:

Python

my_dict = {}