[Python] String Formatting

One particularly useful string method is format. The format method is used to construct strings by inserting values into template strings. Consider this example for generating log messages for a hypothetical web server.

log_message = "IP address {} accessed {} at {}".format(user_ip, url, now)

If the variables user_ip, url and now are defined then they will be substituted for the {} placeholder values:

> print(log_message)
IP address 208.94.117.90 accessed /bears/koala at 16:20