Dictionary in Python
In the world of programming, data management is key, and Python provides a powerful tool for this purpose – the dictionary. Dictionaries are versatile, efficient, and an essential part of every Python programmer’s toolkit. In this blog, we will delve into the world of dictionaries in Python, exploring their features, use cases, and how to leverage their power for efficient data manipulation.
A dictionary in Python is a collection of key-value pairs, where each key is unique and associated with a corresponding value. Dictionaries are also known as associative arrays, hash maps, or hash tables in other programming languages. In Python, dictionaries are enclosed within curly braces {} and consist of key-value pairs separated by colons.
In the below PDF we discuss about Dictionary in Python in detail in simple language, Hope this will help in better understanding.
Here's a simple example:
In Python, dictionaries are enclosed within curly braces {} and consist of key-value pairs separated by colons.Â
my_dict = {'name': 'Alice', 'age': 30, 'city': 'New York'}
In this example, ‘name’, ‘age’, and ‘city’ are the keys, and ‘Alice’, 30, and ‘New York’ are the corresponding values.
- Creating a Dictionary:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â You can create a dictionary in Python using two methods: using curly braces {} or using the dict() constructor. Here are examples of both:
my_dict = {'name': 'Alice', 'age': 30, 'city': 'New York'}
# Using the dict() constructor
another_dict = dict(name='Bob', age=25, city='Los Angeles')
- Modifying and Adding Entries:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â You can modify the value associated with a key in a dictionary by simply assigning a new value to it:To add a new key-value pair to a dictionary, assign a value to a new key:
my_dict['age'] = 31Â # Updates the 'age' to 31
my_dict['email'] = 'alice@example.com'Â # Adds a new key 'email'
Related Question
A dictionary in Python is a data structure that stores a collection of key-value pairs. Each key is unique and is used to access its associated value.
You can create an empty dictionary by using empty curly braces {} or by using the dict() constructor, like this: my_dict = {} or my_dict = dict().
You can add key-value pairs to a dictionary by assigning a value to a specific key. For example: my_dict[‘key’] = ‘value’.
Yes, keys in a Python dictionary can be of different data types, as long as they are hashable. Commonly used data types for keys include strings, numbers, and tuples.
You can access the value associated with a specific key by using square brackets and the key as an index, like this: my_dict[‘key’].
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