code: def _make_lambda_package():
      """Helper function to create mock lambda package"""
      mock_lambda_function = """
  def handler(event, context):
      return event
  """
      package_output = BytesIO()
      package = zipfile.ZipFile(
          package_output, "w", zipfile.ZIP_DEFLATED
      )
      package.writestr("function.zip", mock_lambda_function)
      package.close()
      package_output.seek(0)
  
      return package_output.read()
  
imports: from datetime import datetime
  import uuid
  from io import BytesIO
  import zipfile
  import boto3
  from botocore.exceptions import ClientError
  from streamalert.shared.helpers.aws_api_client import AwsS3
label_desc: Use image node_id 1 for calling a global function with example usage: _make_lambda_package() and returns: package_output