Join a list of strings into one string

A string can be used as a separator to join a list of strings together into a single string using the join() method. For example you can create a string where each element in a list is separated by a space.

>>> " ".join(["once","upon","a","time"])
"once upon a time"

The following example separates the string elements with three hyphens.

>>> "---".join(["once", "upon", "a", "time"])
"once---upon---a---time"