pycharm select multiple lines cursor code example

Example 1: pycharm multiple cursors

Linux/Windows: Alt+j
macOS: Ctrl+g

Example 2: multiple selection in pycharm

Find action
If you do not remember a shortcut for the action you want to use, 
press Ctrl+Shift+A to find any action by name.

For multiple selection, just type "multi" in the dialog box.
I hope you will get the one relevant for your purpose.