Q:

AWS Lambda Python: 'handler' missing on module

I have a deployment package in the following structure:
my-project.zip
    --- my-project.py
    ------ lambda_handler()

Then I define the handler path in configuration file
my-project.lambda_handler
Get the error:
'handler' missing on module

Can not understand that

A:

There are some issues occurring this error.
Issue#1:
The very first issue you’re gonna run into is if you name the file incorrectly, you get this error:
Unable to import module 'lambda_function': No module named lambda_function
If you name the function incorrectly you get this error:

Handler 'handler' missing on module 'lambda_function_file': 'module'
  object has no attribute 'handler'

On the dashboard, make sure the handler field is entered as function_filename.actual_function_name and make sure they match up in your deployment package.
If only the messages were a bit more instructive that would have been a simpler step.
Resource Link:
No lambda_function?
Issue#2:
adrian_praja has solved the issue in aws forum. He answered the following

I belive your index.js should contain
exports.createThumbnailHandler = function(event, context) {}

Issue#3:
Solution: Correctly specify the method call
This happens when the specification of the method called by node.js is incorrect in Lambda's setting.
Please review the specification of the method to call.
In the case of the above error message, I attempted to call the handler method of index.js, but the corresponding method could not be found.
The processing to call is set with "Handler" on the configuration tab.
Below is an example of setting to call the handler method of index.js.

Resource Link:

http://qiita.com/kazuqqfp/items/ac8d93918d0030b31aad
AWS Lambda Function is returning Handler 'handler' missing on module 'index'

