Hands-On Application Development with PyCharm

PyCharm's run arrows

Since you have the file opened in the editor within PyCharm, you will see multiple green arrows to the left of your code, as illustrated here:

Run arrows in PyCharm

You might remember from Chapter 2, Installing and Configuring PyCharm, that by using a similar green arrow located at the beginning of the main scope of a Python program (the if __name__ == '__main__' condition), we can run the whole program. In general, these green arrows are indeed used to run, not just whole Python programs, but also code snippets and, in this case, unit tests. I personally like to call them run arrows.

As you click on any of these run arrows, ...