Option Flags and Directives

The doctest module comes with several option flags that we can use to control doctest's behavior. There are quite a few of them, so we will only look at a couple of examples of one flag to show how we might use them.

One of the easiest ways to use an option flag is with a directive. A doctest directive is a special Python comment that follows an example’s source code. One of the most popular option flags to use is the ELLIPSIS flag. Let’s put the following code into a file and name it test_directives.py: