add python demo example

examples/hello-python/App/web.py

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+import os
+import asyncio
+
+import aioredis
+from aiohttp import web
+
+REDIS_HOST = os.environ.get('REDIS_HOST', 'localhost')
+REDIS_PORT = int(os.environ.get('REDIS_PORT', '6379'))
+REDIS_DB = int(os.environ.get('REDIS_DB', '0'))
+
+redis = aioredis.from_url(f"redis://{REDIS_HOST}:{REDIS_PORT}/{REDIS_DB}")
+app = web.Application()
+routes = web.RouteTableDef()
+
+@routes.get('/')
+async def hello(request):
+    counter = await redis.incr("mycounter")
+    return web.Response(text=f"counter={counter}")
+
+@routes.get('/hello.json')
+async def hello_json(request):
+    counter = await redis.incr("mycounter")
+    data = {'counter': counter}
+    return web.json_response(data)
+
+app.add_routes(routes)
+
+def main():
+    web.run_app(app)
+
+if __name__=='__main__':
+    main()
+

examples/hello-python/Dockerfile

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+FROM python:3.9-alpine
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+CMD [ "python", "-m", "App.web" ]
+EXPOSE 8080
+

examples/hello-python/README.md

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+# Simple Python Demo
+## A Redis counter
+
+```
+podman-compose up -d
+curl localhost:8080/
+curl localhost:8080/hello.json
+```

examples/hello-python/docker-compose.yaml

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+---
+version: '3'
+volumes:
+  redis:
+services:
+  redis:
+    read_only: true
+    image: docker.io/redis:alpine
+    command: ["redis-server", "--appendonly", "yes", "--notify-keyspace-events", "Ex"]
+    volumes:
+    - redis:/data
+  web:
+    read_only: true
+    build:
+      context: .
+    image: hello-py-aioweb
+    ports:
+    - 8080:8080
+    environment:
+      REDIS_HOST: redis
+

examples/hello-python/requirements.txt

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+aiohttp
+aioredis
+# aioredis[hiredis]