Interview questions for python Web services Backend Dev

interview

http://collabedit.com/kj92a

Given a yaml file or a json  file like below,  expose a dict object  that can
be used to hold file's contents in memory and access it's differnt elements.

#Sample content:
#logging:
#    file: service.log
#    level: INFO
#
#auth:
#    username: USER
#    password: PASS
#
#core:
#    urls:
#       url1: google.com
#       url2: twitter.com
#       url2: airbnb.com
#    device:
#        Ram:
#            Tier_1: 2GB
#            Tier_2: 4GB
#            Tier_3: 8GB
#
#        Disk:
#            Tier_1: 20GB
#            Tier_2: 40GB
#            Tier_3: 80GB
#

Example:

Expose a dict object say "config"
which can access elements like below:

config[auth][username] (or) config.auth.username

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1) What does yield imply in python ? Does it mean something else in an async context ?
2) xrange and range, whats up with them?
3) You have done SQl,  so what happens when u have a SELECT * FROM TABLE WHERE id="rackspace" when id is indexed and when it aint
4) Seemed to have worked on nginx,  have u heard of CORS  or how will u do reverse proxy or even better what is reverse proxy
5)  Assuming ur server is listening on https://ticketing.racksapce.com and u are doing a REST call to fetch a resource ,  how do u tell if there is something wrong on server side  or client side.