This isn't PyCharm specific, I actually discovered it in IntelliJ but I though the PyCharm users should benefit too...
Try Alt+Click (Ctrl+Alt+Click if using Gnome default keymap) and drag to select text. It will select bounded blocks instead of complete lines using word wrap. These selected blocks can be used to type repetitive text or delete many parts of a line at once. Try it, you will find uses for it more often than you think!
