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Python Beginner

What is Dictionary?

A built-in data structure that stores key-value pairs with O(1) average lookup time using hash tables.

Python dictionaries (dict) are mutable, unordered collections of key-value pairs. Keys must be hashable (strings, numbers, tuples). Access values with dict[key] or dict.get(key, default).

Since Python 3.7, dictionaries maintain insertion order. Common methods include .keys(), .values(), .items(), .update(), and .pop(). Dictionary comprehensions provide concise creation syntax.

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Pydantic
A data validation library that uses Python type annotations to validate and serialize data with automatic error reporting.
ABC (Abstract Base Class)
A class that defines a common interface for subclasses by declaring abstract methods that must be implemented.
Python Descriptors
Objects that define __get__, __set__, or __delete__ methods, controlling how attribute access works on other objects.
Python Package
A directory containing Python modules and an __init__.py file, providing a way to organize and distribute reusable code.
Python Coroutine
A function defined with async def that can be paused and resumed, enabling concurrent execution without threads.
List Comprehension
A concise syntax for creating new lists by applying an expression to each item in an existing iterable.
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