Update Python3 handler to return result

[roncrivera]

The handler should return instead of printing result to match the Python3 example in the openfaas/templates repo.

Signed-off-by: Ron Rivera roncrivera@gmail.com

[roncrivera]

This looks good @roncrivera

How was it tested?

1. Created sample function from my local python3-debian template that includes the changes to {handler,index}.py

   
   $ faas-cli new python3-debian --lang python3-debian --prefix riverron
   Folder: python3-debian created.
   ___                   _____           ____
   / _ \ _ __   ___ _ __ |  ___|_ _  __ _/ ___|
   | | | | '_ \ / _ \ '_ \| |_ / _` |/ _` \___ \
   | |_| | |_) |  __/ | | |  _| (_| | (_| |___) |
   \___/| .__/ \___|_| |_|_|  \__,_|\__,_|____/
     |_|

Function created in folder: python3-debian Stack file written: python3-debian.yml

2. Built, published and deployed stack the usual way

$ faas-cli build [0] > Building python3-debian. Clearing temporary build folder: ./build/python3-debian/ Preparing ./python3-debian/ ./build/python3-debian/function Building: riverron/python3-debian:latest with python3-debian template. Please wait.. Sending build context to Docker daemon 7.68kB Step 1/17 : FROM python:3 ---> 7c5fd2af3815 Step 2/17 : RUN curl -sSL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog > /usr/bin/fwatchdog && chmod +x /usr/bin/fwatchdog [...] [...] [...]

$ faas-cli deploy Deploying: python3-debian.

Deployed. 202 Accepted. URL: http://192.168.99.100:31112/function/python3-debian

3. Invoked the sample function

$ echo -n 'Hello OpenFaaS!' | faas-cli invoke python3-debian Hello OpenFaaS! $ faas-cli list Function Invocations Replicas python3-debian 3 1

Please let me know if the above test is enough or if there's additional test that needs to be done.

Thanks.

[alexellis]

LGTM