How to check if Python app is running within AWS lambda function?
This works for me
os.environ.get("AWS_EXECUTION_ENV") is not NoneEDIT: I find the existence of the context object insufficient for such a check because you might be mocking it when not running within an AWS lambda function. Then again, you may be mocking the AWS_EXECUTION_ENV as well ...
EDIT: See the other answer, this is a better solution:
os.environ.get("AWS_EXECUTION_ENV") is not NoneOriginal answer:
How about checking for the existence of the context object in the handler function? http://docs.aws.amazon.com/lambda/latest/dg/python-programming-model-handler-types.html
For unit testing I use the structure:
+ my_function/+- __init__.py - empty files+- code/ +- __init__.py +- lambda_function.py+- unittest/ +- __init__.py +- tests.py - from ..code.lambda_function import *When running unit tests with python -m my_function.unittest.tests, in lambda_function.py the __name__ == 'my_function.code.lambda_function'.
When running in the Lambda running, __name__ == 'lambda_function'. Note that you'll get the same value if you run with python -m my_function.code.lambda_function so you'll always need a wrapper.