Part 3. Finding Usages
To be able to try the functionality described in this tutorial and follow it step by step, you'll need an example source code. It can be found here.
Finding usages is another search facility, which can also be perceived as the navigation feature. Suppose, you want to find all the usages of a certain class or method across the entire project, which could amount to a huge number of occurrences!
This is where PyCharm comes to help. Let's see how.
Finding all usages
For example, let's find all usages the class
Mammalia, and then navigate to one of the encountered usages.
Place the caret at the class declaration, and press Alt+F7. The encountered usages of this class show up in the Find tool window:
If you select one of the usages in the Find tool window and press Enter, PyCharm will open the corresponding file in the editor, with the caret at the class
By the way, you can find this action on the context menu of any symbol; for example, on the context menu of the class
This way you can find usages of a symbol with the default settings (across the entire project, overwriting the contents of one tab in the Find tool window).
Other types of finding usages
Besides finding usages, PyCharm provides several other actions performing actually the same task, but in a slightly different manner. All these actions are available on the main menu ():
Some of these actions are mapped to the keyboard shortcuts by default. Let's explore them in details.
Changing search options, or finding usages via dialog
Place the caret at the declaration of a symbol, for example, at the declaration of the method
feeds, and press Ctrl+Shift+Alt+F7. You see the dialog box, where you can change the search options. For example, you prefer to look for usages of a method in the open files, and open each search results in a new tab in the Find tool window:
Click the button Find: PyCharm shows a new tab in the Find tool window, with the found usage of the method
feeds. Double-click this entry (or use the arrow keys and Enter ) - PyCharm opens the editor with the caret at the corresponding usage:
Viewing usages as a list
In some cases, viewing usages in the Find tool window seems inconvenient. PyCharm provides an action that shows usages as a pop-up list. For example, let's see the usages of the class
So place the caret at the class declaration, and then press Ctrl+Alt+F7 (or chooseon the main menu):
If you select one of the usages using the arrow keys and Enter (for example. class
Feline), PyCharm will jump to the corresponding usage and place the caret at it.
Now look at the toolbar of the pop-up window. If you still think that it would be nice to view usages in the Find tool window, click the pin button . The pop-up list disappears, and instead you see the search results in the well-known Find tool window.
Finally, if you are not happy with the search options, click to show the dialog box.
Viewing usages in the current file
To view usages of a symbol in the current file, press Ctrl+Shift+F7 (or chooseon the main menu):
As you see, each of the usages is marked with a stripe in the right gutter. When you hover your mouse pointer over such a marker, a balloon with the description of a specific usage appears. If you click the stripes, you can navigate from one usage to another.
This tutorial is over - congrats! Here you've learned how to:
- Use the various Find Usages operations.
- Use the right gutter as the source of information.
Let's proceed with Part 4 and see how to navigate using Navigation bar only.