This is the error I get when I try to invoke my lambda function as a ZIP file. 

"The file lambda_function.py could not be found. Make sure your
  handler upholds the format: file-name.method."

What am I doing wrong?
Just to clarify: If I want to invoke Keras all I have to do is download the Keras directories and put my lambda code and Keras directories as a zip folder and upload it directly from my desktop right? 
Just wanted to know if this is the right method to invoke Keras.
Error when invoking lambda function as a ZIP file