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This repository was archived by the owner on Dec 2, 2021. It is now read-only.

Commit 176dc38

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updated more ch. 18 examples to Python 3.7
1 parent 29d6835 commit 176dc38

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4 files changed

+47
-64
lines changed

4 files changed

+47
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‎18-asyncio-py3.7/countdown.py

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#!/usr/bin/env python3
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# Inspired by
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# https://snarky.ca/how-the-heck-does-async-await-work-in-python-3-5/
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import asyncio
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import time
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async def countdown(label, delay):
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tabs = (ord(label) - ord('A')) * '\t'
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n = 3
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while n > 0:
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await asyncio.sleep(delay) # <----
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dt = time.perf_counter() - t0
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print('━' * 50)
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print(f'{dt:7.4f}s \t{tabs}{label} = {n}')
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n -= 1
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loop = asyncio.get_event_loop()
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tasks = [
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loop.create_task(countdown('A', .7)),
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loop.create_task(countdown('B', 2)),
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loop.create_task(countdown('C', .3)),
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loop.create_task(countdown('D', 1)),
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]
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t0 = time.perf_counter()
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loop.run_until_complete(asyncio.wait(tasks))
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loop.close()
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print('━' * 50)

‎18-asyncio-py3.7/spinner_asyncio.py

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# spinner_await.py
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#!/usr/bin/env python3
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# spinner_asyncio.py
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# credits: Example by Luciano Ramalho inspired by
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# Michele Simionato's multiprocessing example in the python-list:
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# https://mail.python.org/pipermail/python-list/2009-February/538048.html
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# BEGIN SPINNER_AWAIT
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# BEGIN SPINNER_ASYNCIO
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import asyncio
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import itertools
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import sys
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flush()
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write('\x08' * len(status))
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try:
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await asyncio.sleep(.1) # <3>
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except asyncio.CancelledError: # <4>
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await asyncio.sleep(.1) # <2>
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except asyncio.CancelledError: # <3>
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break
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write(' ' * len(status) + '\x08' * len(status))
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async def slow_function(): # <5>
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async def slow_function(): # <4>
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# pretend waiting a long time for I/O
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await asyncio.sleep(3) # <6>
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await asyncio.sleep(3) # <5>
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return 42
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async def supervisor(): # <7>
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spinner = asyncio.create_task(spin('thinking!')) # <8>
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print('spinner object:', spinner) # <9>
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result = await slow_function() # <10>
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spinner.cancel() # <11>
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async def supervisor(): # <6>
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spinner = asyncio.create_task(spin('thinking!')) # <7>
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print('spinner object:', spinner) # <8>
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result = await slow_function() # <9>
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spinner.cancel() # <10>
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return result
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def main():
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result = asyncio.run(supervisor()) # <12>
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result = asyncio.run(supervisor()) # <11>
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print('Answer:', result)
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if __name__ == '__main__':
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main()
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# END SPINNER_AWAIT
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# END SPINNER_ASYNCIO

‎18-asyncio-py3.7/spinner_curio.py

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‎18-asyncio-py3.7/spinner_thread.py

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#!/usr/bin/env python3
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# spinner_thread.py
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# credits: Adapted from Michele Simionato's

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