Summary of "Asyncio in Python - Full Tutorial"
Main Ideas and Concepts
-
Synchronous vs. Asynchronous Programming
- Synchronous Programming: Tasks are executed in a straight line; if one task is delayed, the entire program pauses.
- Asynchronous Programming: Allows multiple tasks to run simultaneously without waiting for one to finish before starting another. This is likened to sending out scouts to explore different paths at once.
-
When to Use AsyncIO
- AsyncIO is ideal for tasks that involve waiting (e.g., network requests, file reading).
- Threads are better for IO-bound tasks that share data.
- Processes are suited for CPU-intensive tasks.
-
Key Concepts of AsyncIO
- Event Loop: Central hub managing tasks, allowing them to run efficiently. Tasks that are waiting (e.g., for data) yield control back to the loop.
- Co-routines: Functions defined with the
async
keyword that return a co-routine object. They must be awaited to execute. - Await Keyword: Used within asynchronous functions to pause execution until the awaited co-routine completes.
- Tasks: Allow scheduling of Co-routines to run concurrently. They enable the program to switch to another task when one is waiting.
- Gather Function: A way to run multiple Co-routines concurrently and collect their results.
- Task Group: A newer method for creating multiple tasks with built-in error handling, cancelling other tasks if one fails.
-
Synchronization Primitives
- Locks: Ensure that only one co-routine accesses a shared resource at a time, preventing conflicts.
- Semaphores: Allow a specified number of Co-routines to access a resource simultaneously, useful for throttling requests.
- Events: Simple synchronization mechanism that allows waiting for a condition to be met before proceeding.
Methodology and Instructions
- Using AsyncIO:
- Import the
AsyncIO
module. - Define asynchronous functions using the
async
keyword. - Start the Event Loop with
AsyncIO.run()
, passing a co-routine. - Use the
await
keyword to execute Co-routines within asynchronous functions. - Create tasks with
AsyncIO.create_task()
to run Co-routines concurrently. - Use
AsyncIO.gather()
to run multiple Co-routines and collect results. - Implement synchronization with locks, semaphores, and events as needed.
- Import the
Speakers or Sources Featured
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Category
Educational