PyCharm allows configuring Python interpreters on the various stages of development:
- When a project is only being created (File | New Project, or Create New Project on the Welcome screen).
- In an already existing project, there are two options:
- When you're in the editor, the most convenient way is to use the Python Interpreter widget in the
Status bar.

Click the widget and select Add Interpreter ....
- If you are in the Settings/Preferences dialog, select Project <project name> | Project Interpreter.
Click the
icon and select Add.