updated ch. 18 examples (http_charfinder) to Python 3.7

18-asyncio-py3.7/charfinder/http_charfinder.py

@@ -0,0 +1,62 @@
+import asyncio
+from aiohttp import web
+import sys
+
+from charfinder import UnicodeNameIndex
+
+TEMPATE_NAME = 'http_charfinder.html'
+
+CONTENT_TYPE = 'text/html'
+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(TEMPATE_NAME) as tpl:
+    template = tpl.read()
+template = template.replace('{links}', LINKS_HTML)
+
+def home(request):
+    query = request.path_qs[8:].strip()
+    print('Query: {!r}'.format(query))
+    if query:
+        descriptions = list(index.find_descriptions(query))
+        res = ''
+        for r in [desc for desc in descriptions]: res += ROW_TPL.format(code_str=r.code_str, char=r.char, name=r.name) + '\n'
+        msg = index.status(query, len(descriptions))
+    else:
+        descriptions = []
+        res = ''
+        msg = 'Enter words describing characters.'
+
+    html = template.format(query=query, result=res, message=msg)
+    print('Sending {} results'.format(len(descriptions)))
+    return web.Response(content_type=CONTENT_TYPE, text=html)
+
+async def init(loop, address, port):
+    app = web.Application(loop=loop)
+    app.router.add_route('GET', '/', home)
+    handler = app.make_handler()
+    server = await loop.create_server(handler, address, port)
+    return server.sockets[0].getsockname()
+
+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))
+    print('Serving on {}. Hit CRTL-C to stop.'.format(host))
+    try:
+        loop.run_forever()
+    except KeyboardInterrupt:
+        pass
+    print('Server shutting down.')
+    loop.close()
+
+if __name__ == "__main__":
+    main(*sys.argv[1:])