The asyncio framework in action

As you have seen, asyncio provides a simple and intuitive way to implement the framework of an asynchronous program with Python's asynchronous programming keywords. With that, let's consider the process of applying the framework provided to a synchronous application in Python, and convert it to an asynchronous one.

Asynchronously counting down

Let's take a look at theChapter17/example1.pyfile, as follows:

# Chapter17/example1.py

import time

def count_down(name, delay):
    indents = (ord(name) - ord('A')) * '\t'

    n = 3
    while n:
        time.sleep(delay)

        duration = time.perf_counter() - start
        print('-' * 40)
        print('%.4f \t%s%s = %i' % (duration, indents, name, n))

        n -= 1

start = time.perf_counter()

count_down('A', 1)
count_down('B', 0.8)
count_down('C', 0.5)

print('-' * 40)
print('Done.')

The goal of this example is to illustrate the asynchronous nature of overlapping the processing and waiting time of independent...