[PYTHON] Get the region where AWS Lambda is running

Since the region is set in the environment variable ʻAWS_DEFAULT_REGION`, you can get it by accessing the environment variable in your language. In python, it looks like this:

import os
def lambda_handler(event, context):
    print "REGION:" + os.getenv("AWS_DEFAULT_REGION")

You can check other environment variables that can be used from here.

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