Lära What is Asynchronous Programming? | Getting Started with Asyncio

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When you write Python code, you usually run it in a synchronous way: each line finishes before the next one starts. This is called synchronous programming. For example, if your code needs to fetch data from the internet or wait for a file to load, the entire program stops and waits until that operation is finished. This can make your programs slow or unresponsive, especially if you have to wait for several slow tasks.

Asynchronous programming is different. Instead of waiting for each task to finish before starting the next, your code can start a task, move on to something else, and come back to the first task when it's ready. This is especially useful for operations that spend a lot of time waiting, like network requests, file input/output, or timers. In Python, the asyncio library lets you write asynchronous code that can handle many waiting tasks at once, making your programs more efficient and responsive.


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import time
import asyncio

def sync_wait():
    print("Synchronous: Waiting for 2 seconds...")
    time.sleep(2)
    print("Synchronous: Done!")

async def async_wait():
    print("Asynchronous: Waiting for 2 seconds...")
    await asyncio.sleep(2)
    print("Asynchronous: Done!")

# Run the synchronous version
sync_wait()

# Run the asynchronous version
asyncio.run(async_wait())

In the code above, the sync_wait function uses time.sleep(2) to pause for two seconds. During this pause, nothing else can happen in your program. The async_wait function, on the other hand, uses await asyncio.sleep(2), which allows other tasks to run while waiting. This is a key difference between synchronous and asynchronous programming.

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