code: def create_lambda_function(function_name, region):
      """Helper function to create mock lambda function"""
      if function_name.find(":") != -1:
          function_name = function_name.split(":")[0]
  
      boto3.client("lambda", region_name=region).create_function(
          FunctionName=function_name,
          Runtime="python3.7",
          Role="test-iam-role",
          Handler="function.handler",
          Description="test lambda function",
          Timeout=3,
          MemorySize=128,
          Publish=True,
          Code={"ZipFile": _make_lambda_package()},
      )
  
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 2 for calling a global function with example usage: create_lambda_function(function_name, region) without return types