Thank you for answer Nick. Sorry I didn't know very well what's 
the purpose of this forum. I have posted this question to Stackoverflow.
This is the 
url: 
http://stackoverflow.com/questions/38015675/send-email-throught-gmail-api-google-app-engine
For your point number one I modified the name of variables in Stackoverflow 
I forget to change here, I currently use service instance, it is gmail 
variable.
For your point two I guess yes, I described more details about this on 
Stackoverflow question.
Thanks for all.

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