Adding Python hot fn sample

examples/tutorial/hotfunctions/http/python/Dockerfile

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+FROM jjanzic/docker-python3-opencv
+
+RUN mkdir /code
+ADD . /code/
+WORKDIR /code
+RUN pip3 install -r requirements.txt
+
+WORKDIR /code/
+ENTRYPOINT ["python3", "func.py"]

examples/tutorial/hotfunctions/http/python/func.py

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+import asyncio
+import sys
+import uvloop
+
+from hotfn.http import request
+from hotfn.http import response
+
+
+class MyProtocol(asyncio.Protocol):
+
+    def connection_made(self, transport):
+        print('pipe opened', file=sys.stderr, flush=True)
+        super(MyProtocol, self).connection_made(transport=transport)
+
+    def data_received(self, data):
+        print('received: {!r}'.format(data), file=sys.stderr, flush=True)
+        data = data.decode()
+        req = request.RawRequest(data)
+        (method, url, dict_params,
+         headers, http_version, req_data) = req.parse_raw_request()
+
+        rs = response.RawResponse(
+            http_version, 200, "OK",
+            response_data=req_data)
+        print(rs.dump(), file=sys.stdout, flush=True)
+        super(MyProtocol, self).data_received(data)
+
+    def connection_lost(self, exc):
+        print('pipe closed', file=sys.stderr, flush=True)
+        super(MyProtocol, self).connection_lost(exc)
+
+
+if __name__ == "__main__":
+    with open("/dev/stdin", "rb", buffering=0) as stdin:
+        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+        loop = asyncio.get_event_loop()
+        try:
+            stdin_pipe_reader = loop.connect_read_pipe(MyProtocol, stdin)
+            loop.run_until_complete(stdin_pipe_reader)
+            loop.run_forever()
+        finally:
+            loop.close()

examples/tutorial/hotfunctions/http/python/func.yaml

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+name: fnproject/hotfn-py
+version: 0.0.1
+runtime: docker
+type: sync
+memory: 521
+format: http
+path: /hot-json

examples/tutorial/hotfunctions/http/python/requirements.txt

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+hotfn
+uvloop