Keynote David Beazley - Topics of Interest (Python Asyncio)

Those example code was original from Python Brasil 2015 Keynote. It's all about whether interface of asyncio is necessary or not.

Source: Keynote David Beazley - Topics of Interest (Python Asyncio)

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Background Knowledge

1.yield

$ python yield.py
5
4
3
2
1

2.coroutine

$ python coroutine.py 
>>>> send1
somevalue

>>>> send2
The result is None
Traceback (most recent call last):
  File "background_knowledge_coroutine.py", line 13, in <module>
    print(f.send(None))
StopIteration

3.coroutine + async

$ python coroutine_async.py
>>>> send1
Start foo()
somevalue

>>>> send2
The result is None
End foo()
Traceback (most recent call last):
  File "background_knowledge_coroutine_async.py", line 17, in <module>
    print(f.send(None))
StopIteration

4.coroutine + async + async

$ python coroutine_async2.py
>>>> send1
Start bar()
Start foo()
somevalue

>>>> send2
The result is None
End foo()
End bar()
Traceback (most recent call last):
  File "background_knowledge_coroutine_async2.py", line 22, in <module>
    print(f.send(None))
StopIteration

5.examples of invalid syntax

$ python background_knowledge_invalid_syntax.py

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Echo server

Here are three echo servers:

• aecho.py: asyncio + interface
• mecho.py: asyncio with your own interface - myasyncio.py
• gecho.py: gevent

Run echo server

*Must install requirement.txt while using gecho.py
$ pip install -r requirement.txt

> Terminal 1: Run server first
$ python [aecho.py|mecho.py|gecho.py]

> Terminal 2: Connect to server by netcat
$ nc localhost 50000

> Terminal 1: Check the reaction of server
Connection from:  ('127.0.0.1', XXXXX)

> Terminal 2: Check the function of echo server
asd
Got: asd
Ctrl+C

> Terminal 1: Check the reaction of server
Connection closed

Run benchmark

> Terminal 1: Run server first
$ python [aecho.py|mecho.py|gecho.py]

> Terminal 2: Run benchmark
$ python bench.py

Result of benchmark

• aecho.py: (12638.540409225803, 'messages/sec')
• mecho.py: (19400.764281054424, 'messages/sec')
• gecho.py: (21307.778045333405, 'messages/sec')

gevent had the best performance. However, asyncio with its interface had the worst performance.