Basics
Python Dictionaries
Python Dictionaries
Python dictionaries store key-value pairs, with get() for safe access.
What is a Python Dictionary?
A Python dictionary is an unordered collection that stores data in key-value pairs. Each key is unique and acts as an identifier for its associated value. This data structure is highly versatile, allowing for efficient data retrieval and manipulation.
Creating a Dictionary
Creating a dictionary in Python is straightforward. You can initialize a dictionary using curly braces {} or the dict() constructor.
Accessing Dictionary Values
To access a value in a dictionary, you use the key associated with it. Be cautious, accessing a key that does not exist will raise a KeyError.
Safe Access with get() Method
The get() method provides a safe way to access values in a dictionary. It returns None or a specified default value if the key is not found.
Adding and Updating Entries
To add or update key-value pairs in a dictionary, simply assign a value to a key. If the key exists, its value will be updated; if not, a new key-value pair will be added.
Removing Entries from a Dictionary
Keys and their associated values can be removed using the del statement or the pop() method, which also returns the removed value.
Iterating Over a Dictionary
You can iterate over dictionaries to access keys, values, or both. Using the items() method allows you to loop through key-value pairs directly.
Basics
- Introduction
- Installation
- Running Code
- Syntax
- Variables
- Data Types
- Numbers
- Strings
- Booleans
- Type Conversion
- Operators
- Ternary Operator
- If Else
- Match Case
- While Loops
- For Loops
- Lists
- Tuples
- Dictionaries
- Sets
- Comprehensions
- Functions
- Arguments
- Scope
- Errors
- Debugging
- String Formatting
- Security Basics
- Best Practices
- User Input
- Built-in Functions
- Keywords
