{
 "errorMessage": "Unable to import module 'lambda_function'"
}

$ zip ../path/to/my/deployment-package.zip ./my_function.py

$ cd ../path/to/my/py2.7_virtualenv
$ zip -ru ../path/to/deployment-package.zip *

$ ls -l
$ -rw-r--r--   1 user  staff  9036477 Feb 26 00:15 deployment-package.zip

$ unzip deployment-package.zip
...
$ ls
deployment-package.zip      XlsxWriter-0.9.6.dist-info
_markerlib                  pip
boto3                       pip-7.1.0.dist-info
boto3-1.4.4.dist-info       pkg_resources
botocore                    python_dateutil-2.6.0.dist-info
botocore-1.5.18.dist-info   s3transfer
concurrent                  s3transfer-0.1.10.dist-info
dateutil                    setuptools
...