Hello World API CloudFormation - Python Lambda

Hello_World_API-Lambda.yml

  Lambda:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: |
        def handler(event, context):
          response = {
            'isBase64Encoded': False,
            'statusCode': 200,
            'body': 'HELLO WORLD!'
          }
          return response
      Handler: lambda_function.handler
      Role: !GetAtt LambdaRole.Arn
      Runtime: python3.7
      
  LambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Statement:
          - Action: ['sts:AssumeRole']
            Effect: Allow
            Principal:
              Service: ['lambda.amazonaws.com']
      Path: /
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  LambdaFunctionPermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt Lambda.Arn
      Action: 'lambda:InvokeFunction'
      Principal: elasticloadbalancing.amazonaws.com