A #microtutorial to show how to use asyncio and some other stdlib-tools, https://pugetsoundpython.slack.com/archives/C03LJKBPJ/p1530204386000485

nhuntwalker-asyncio.py

#!/usr/bin/env python
'''
A #microtutorial to show how to use asyncio and some other stdlib-tools,
 https://pugetsoundpython.slack.com/archives/C03LJKBPJ/p1530204386000485
 
 
Invoke with,
`python nhuntwalker-asyncio.py -m on`
`python nhuntwalker-asyncio.py -m awe`
`python nhuntwalker-asyncio.py`

For interesting results
'''
import argparse
import asyncio
import enum
import logging
import typing

# Always configure logging after std-lib and before pip/conda-installed libs.
#  Sometimes when you import a module, it logs debug/info/error
logger = logging.getLogger('') # <--- Probable a good idea to name your logger. '' is the 'root' logger
sysHandler = logging.StreamHandler()
sysHandler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
logger.addHandler(sysHandler)
logger.setLevel(logging.INFO)

import requests

EVENT_LOOP = None

class Mode(enum.Enum):
  ON = 'on'
  OFF = 'off'

def _obtain_event_loop():
  """
  The native implementation of asyncio will return the same event loop.
    uvloop will not.
  """
  global EVENT_LOOP
  if EVENT_LOOP is None:
    EVENT_LOOP = asyncio.get_event_loop()

  return EVENT_LOOP

def capture_options() -> typing.Any:
  parser = argparse.ArgumentParser()
  parser.add_argument('-m', '--mode', default=Mode.OFF, type=Mode)
  return parser.parse_args()

async def main(options: typing.Any) -> None:
  if options.mode is Mode.ON:
    logger.info('ON')
  else:
    logger.info('OFF')

  assert requests.get('https://jbcurtin.io/index.html').status_code is 200, 'jbcurtin.io seems to be down'

if __name__ in ['__main__']:
  options = capture_options()
  loop = _obtain_event_loop()
  loop.run_until_complete(main(options))