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Dictionaries

Overview:

A dictionary in Python is a data structure that allows you to store and retrieve values using keys. It is also known as a hashmap or associative array in other programming languages. Dictionaries are implemented as hash tables, providing fast access to values based on their keys.

Creating a Dictionary:

my_dict = {'name': 'John', 'age': 25, 'city': 'New York'}

Accessing Values:

print(my_dict['name'])  # Output: John

Modifying and Adding Elements:

my_dict['age'] = 26  # Modifying a value
my_dict['occupation'] = 'Engineer'  # Adding a new key-value pair

Removing Elements:

del my_dict['city']  # Removing a key-value pair

Checking Key Existence:

if 'age' in my_dict:
    print('Age is present in the dictionary')

Iterating Through Keys and Values:

for key, value in my_dict.items():
    print(key, value)