Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "First, when you call a timeout with the EXPIRE command on a key, the timeout can only be cleared if you delete the key or replace the key."

A block of code is set as follows:

defcreate_tea(datastore, name, time, size):
  # Increment and save global counter
  tea_counter = datastore.incr("global/teas")
  tea_key = "tea/{}".format(tea_counter)
 datastore.hmset(tea_key,
      {"name": name,
      "brew-time": time,
      "box-size": size})
  return tea_key

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

127.0.0.1:6379> LATENCY HISTORY command
1) 1) (integer) 1433877379
   2) (integer) 1000
2) 1) (integer) 1433877394
   2) (integer) 250

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.