Dictionaries in Python
Hey there! In this guide, we'll explore dictionaries in Python. Dictionaries are unordered collections of key-value pairs that allow you to store and manipulate data efficiently. Let's dive in!
Python Dictionaries
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Dictionaries are unordered collections of key-value pairs.
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They are mutable, allowing you to change their contents after creation.
Video Explanation
1. Creating a Dictionary
You can create a dictionary using curly braces {} or the dict() function.
my_dict = {'name': 'John', 'age': 30} # Create a dictionary using curly braces
another_dict = dict(name='Jane', age=25) # Create a dictionary using the dict() function
print(my_dict) # Output: {'name': 'John', 'age': 30}
print(another_dict) # Output: {'name': 'Jane', 'age': 25}
2. Accessing Elements
You can access values in a dictionary using their keys.
my_dict = {'name': 'John', 'age': 30} # Define a dictionary
print(my_dict['name']) # Access value using key, Output: 'John'
print(my_dict['age']) # Access value using key, Output: 30
3. Adding Elements
You can add new key-value pairs to a dictionary using assignment.
my_dict['city'] = 'New York' # Add a new key-value pair
print(my_dict) # Output: {'name': 'John', 'age': 30, 'city': 'New York'}
4. Removing Elements
You can remove key-value pairs using the del statement or the pop() method.
del my_dict['age'] # Remove an element using del
print(my_dict) # Output: {'name': 'John', 'city': 'New York'}
age = my_dict.pop('city') # Remove and return an element using pop()
print(age) # Output: 'New York'
print(my_dict) # Output: {'name': 'John'}
5. Dictionary Methods
Dictionaries have several built-in methods for manipulation.
my_dict = {'name': 'John', 'age': 30} # Define a dictionary
keys = my_dict.keys() # Get all keys
values = my_dict.values() # Get all values
items = my_dict.items() # Get all key-value pairs
print(keys) # Output: dict_keys(['name', 'age'])
print(values) # Output: dict_values(['John', 30])
print(items) # Output: dict_items([('name', 'John'), ('age', 30)])
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