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: "We simply specify a SYSTEM_TIME that Athena will use to set the read point in the transaction log."

A block of code is set as follows:

try:
	sink.writeFrame(new_and_updated_impressions_dataframe)
	glueContext.commit_transaction(txid1)
except:
	glueContext.abort_transaction(txid1)

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

"inventory_id","item_name","available_count"
"1","A simple widget","5"
"2","A more advanced widget","10"
"3","The most advanced widget","1"
"4","A premium widget","0"
"5","A gold plated widget","9" 

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: "Administrators can set a workgroup to encrypt query results. In the workgroup settings, set query results to be encrypted using SSE-KMS, CSE-KMS, or SSE-S3 and check the Override client-side settings."

Tips or important notes

Appear like this.