Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “Using the Terraform CLI, the developers were able to roll out the entire infrastructure stack using a single terraform deploy command.”

A block of code is set as follows:

InstanceTargetGroup:  Type: AWS::ElasticLoadBalancingV2::TargetGroup
  Properties:
    HealthCheckEnabled: true
    TargetType: instance
    Protocol: HTTP
    Port: 8080
    VpcId:
      Fn::ImportValue:
        'Fn::Sub': "${NetworkStackName}-vpc-id"}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

@app.post("/<id>/delete")def delete(id):
    if (request.method == "POST"):
        logging.info('Deleting task represented by ID: \'%s\' ',ObjectId(id))
        todos_collection.delete_one({"_id": ObjectId(id)})
        return redirect(url_for('todos'))

Any command-line input or output is written as follows:

$ npm install$ cdk synth

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “In the later chapters, we will learn about the relevant AWS services, such as CloudFormation and Cloud Development Kit (CDK).”

Tips or important notes

Appear like this.