What is Asyncio:
Asyncio is a python library which stands for Asynchronous IO. It basically uses Async or Await syntax to write the concurrent codes. This library allows developers to write concurrent programming code that can handle multiple tasks simultaneously.
By using Asyncio developers can manage tasks more efficiently leading to improved performance
Difference between Asyncio & Threading:
For your better understanding let us clearly understand the difference between Asyncio and Threading.
Asyncio and Threading both basically are python libraries used to achieve concurrency in the tasks. The major difference in both the libraries is-
- Asyncio helps python programs to run multiple tasks at the same time without waiting for each task to finish. Whereas Threading runs multiple threads simultaneously, each thread handling a separate task.
- Asyncio is basically ideal for I/O ( Input-Output ) bound tasks like in a Web Page or in a file operation. Whereas Threading can be used in CPU bound tasks and in parallel processing as well.
- In Asyncio, We can decide which part of the code needs to be processed urgently and which part of it can wait, all this is done with the Await command. While in Threading we can’t choose when to run which code and in which thread.
What is a Coroutine in Asyncio ?
Before proceeding further with the code and how to implement Async io, it is essential to understand what basically Coroutine is as it will help you to understand code in better way:
So, In Python’s Asyncio library, coroutines are special functions that can be paused and resumed during execution. They are declared using the <async def> syntax. When a coroutine encounters an awaitable operation (like reading data from a file), it can pause its execution and allow other coroutines to run in the meantime.
Hope you got a basic idea of what coroutine is, let’s make it more clear by understanding through the code below.
How to define a Coroutine function in Ansyncio?
To make Coroutine more clear let us understand it with the help of code:
import asyncio
async def main():
print(“Good Morning”)
asyncio.run(main())
This is a basic code to call the Asyncio and Coroutine function. Let’s understand this code line by line for your better clarity.
- <Import asyncio> used in above code is used to import asyncio libraries in the python code.
- <Async def> is used to declare a coroutine function in python.
- Here in this code “good morning” is being printed, also using asyncio function will automatically create an event loop which will close the program at the end.
How to Pause an execution in Async function:
To pause an execution in async function we generally use <await> keyword, let us understand this clearly with an example of code:
import asyncio
async def main():
print(“old address is Chandigarh”)
await new(‘Meerut’)
async def new(address):
await asyncio.sleep(3)
print(‘new address is :’)
print(name)
asyncio.run(main())
In the above example, we are using <await> keyword in “asyncio.sleep(3)” in the new function that is “Meerut” which means that we are pausing the execution for three seconds.Here while executing this code, You will observe that the message “new address is Meerut” will be printed after three seconds of delay.
What is Aiohttp in Ansyncio ?
Aiohttp is basically defined as a Python library used for asynchronous HTTP client/server development.
It allows developers to create web servers that can handle HTTP requests and responses asynchronously, making it suitable for building high-performance websites and web applications.
Why do we use Aiohttp in Web development ?
You must be thinking of why we are using Aiohttp library in web development and not a simple requests library as requests library is also used to make HTTP requests.
This is because the requests library does not support the Asyncio library. This is a major limitation of the Asyncio library, as many classic Python libraries still don’t support the Asyncio library.
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FAQs on Asyncio:
What is an event loop in Asyncio ?
The event loop in Asyncio is a central component that manages the execution of coroutines and asynchronous tasks. It is basically responsible for scheduling and coordinating the execution of tasks efficiently.
What are awaitables in Asyncio ?
Awaitables are objects that can be awaited in coroutines. They basically include Tasks, commands etc. When awaited, they pause the execution of the coroutine until the result is available.
Is Asyncio Suitable for Web development?
Yes, Asyncio is suitable for web development, especially for building a quick and responsive web page. Asyncio is used quite a lot.
How many threads does Asyncio use?
Asyncio basically uses a single thread to run multiple tasks, without waiting for a particular task to finish.