https://www.jetbrains.com/help/pycharm/2017.1/highlighting-usages.html
Highlighting usages in the current file
To highlight usages of a symbol in the current file
- Place the caret at the selected symbol in the editor. If automatic usages highlighting is enabled, see all its occurrences in the current file highlighted. Otherwise, proceed to the next step.
- On the main menu, choose
Navigating among usages
To navigate among usages, do one of the following
- Click on a stripe in the marker bar to navigate to the respective usage location.
- Use F3 and Shift+F3 keyboard shortcuts, to navigate to the next and previous usages respectively.
Removing highlighting
To remove highlighting of usages
- Press Escape.