Sublime Text has this functionality where you can select text and start editing each line with a (multiple) cursor:
Sublime like features for MacOS X in PyCharm:
Select/Unselect the next occurrence with Ctrl+G / Shift+Ctrl+G
Ctrl+G
Shift+Ctrl+G
Select all occurrences at once with Ctrl+Cmd+G
Ctrl+Cmd+G
Remove occurrences with ESC
ESC