updated some examples from ch. 17 e 18 to Python 3.7

18-asyncio-py3.7/spinner_asyncio.py

@@ -31,7 +31,7 @@ async def slow_function():  # <5>
 
 
 async def supervisor():  # <7>
-    spinner = asyncio.ensure_future(spin('thinking!'))  # <8>
+    spinner = asyncio.create_task(spin('thinking!'))  # <8>
     print('spinner object:', spinner)  # <9>
     result = await slow_function()  # <10>
     spinner.cancel()  # <11>
@@ -39,9 +39,7 @@ async def supervisor():  # <7>
 
 
 def main():
-    loop = asyncio.get_event_loop()  # <12>
-    result = loop.run_until_complete(supervisor())  # <13>
-    loop.close()
+    result = asyncio.run(supervisor())  # <12>
     print('Answer:', result)
 
 

18b-async-await/charfinder/http_charfinder.html

@@ -1,19 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="utf-8">
-    <title>Charfinder</title>
-  </head>
-  <body>
-    Examples: {links}
-    <p>
-      <form action="/">
-        <input type="search" name="query" value="{query}">
-        <input type="submit" value="find"> {message}
-      </form>
-    </p>
-    <table>
-      {result}
-    </table>
-  </body>
-</html>

18b-async-await/charfinder/http_charfinder.py

@@ -1,71 +0,0 @@
-#!/usr/bin/env python3
-
-import sys
-import asyncio
-from aiohttp import web
-
-from charfinder import UnicodeNameIndex
-
-TEMPLATE_NAME = 'http_charfinder.html'
-CONTENT_TYPE = 'text/html; charset=UTF-8'
-SAMPLE_WORDS = ('bismillah chess cat circled Malayalam digit'
-                ' Roman face Ethiopic black mark symbol dot'
-                ' operator Braille hexagram').split()
-
-ROW_TPL = '<tr><td>{code_str}</td><th>{char}</th><td>{name}</td></tr>'
-LINK_TPL = '<a href="/?query={0}" title="find &quot;{0}&quot;">{0}</a>'
-LINKS_HTML = ', '.join(LINK_TPL.format(word) for word in
-                       sorted(SAMPLE_WORDS, key=str.upper))
-
-
-index = UnicodeNameIndex()
-with open(TEMPLATE_NAME) as tpl:
-    template = tpl.read()
-template = template.replace('{links}', LINKS_HTML)
-
-# BEGIN HTTP_CHARFINDER_HOME
-def home(request):  # <1>
-    query = request.GET.get('query', '').strip()  # <2>
-    print('Query: {!r}'.format(query))  # <3>
-    if query:  # <4>
-        descriptions = list(index.find_descriptions(query))
-        res = '\n'.join(ROW_TPL.format(**vars(descr))
-                        for descr in descriptions)
-        msg = index.status(query, len(descriptions))
-    else:
-        descriptions = []
-        res = ''
-        msg = 'Enter words describing characters.'
-
-    html = template.format(query=query, result=res,  # <5>
-                           message=msg)
-    print('Sending {} results'.format(len(descriptions)))  # <6>
-    return web.Response(content_type=CONTENT_TYPE, text=html) # <7>
-# END HTTP_CHARFINDER_HOME
-
-
-# BEGIN HTTP_CHARFINDER_SETUP
-async def init(loop, address, port):  # <1>
-    app = web.Application(loop=loop)  # <2>
-    app.router.add_route('GET', '/', home)  # <3>
-    handler = app.make_handler()  # <4>
-    server = await loop.create_server(handler,
-                                           address, port)  # <5>
-    return server.sockets[0].getsockname()  # <6>
-
-def main(address="127.0.0.1", port=8888):
-    port = int(port)
-    loop = asyncio.get_event_loop()
-    host = loop.run_until_complete(init(loop, address, port))  # <7>
-    print('Serving on {}. Hit CTRL-C to stop.'.format(host))
-    try:
-        loop.run_forever()  # <8>
-    except KeyboardInterrupt:  # CTRL+C pressed
-        pass
-    print('Server shutting down.')
-    loop.close()  # <9>
-
-
-if __name__ == '__main__':
-    main(*sys.argv[1:])
-# END HTTP_CHARFINDER_SETUP

18b-async-await/spinner_asyncio.py

@@ -1,53 +0,0 @@
-# spinner_asyncio.py
-
-# credits: Example by Luciano Ramalho inspired by
-# Michele Simionato's multiprocessing example in the python-list:
-# https://mail.python.org/pipermail/python-list/2009-February/538048.html
-
-# BEGIN SPINNER_ASYNCIO
-import asyncio
-import itertools
-import sys
-
-
-@asyncio.coroutine  # <1>
-def spin(msg):  # <2>
-    write, flush = sys.stdout.write, sys.stdout.flush
-    for char in itertools.cycle('|/-\\'):
-        status = char + ' ' + msg
-        write(status)
-        flush()
-        write('\x08' * len(status))
-        try:
-            yield from asyncio.sleep(.1)  # <3>
-        except asyncio.CancelledError:  # <4>
-            break
-    write(' ' * len(status) + '\x08' * len(status))
-
-
-@asyncio.coroutine
-def slow_function():  # <5>
-    # pretend waiting a long time for I/O
-    yield from asyncio.sleep(3)  # <6>
-    return 42
-
-
-@asyncio.coroutine
-def supervisor():  # <7>
-    spinner = asyncio.async(spin('thinking!'))  # <8>
-    print('spinner object:', spinner)  # <9>
-    result = yield from slow_function()  # <10>
-    spinner.cancel()  # <11>
-    return result
-
-
-def main():
-    loop = asyncio.get_event_loop()  # <12>
-    result = loop.run_until_complete(supervisor())  # <13>
-    loop.close()
-    print('Answer:', result)
-
-
-if __name__ == '__main__':
-    main()
-# END SPINNER_ASYNCIO