I'm manually swapping out PyCharm keymap to be more like Sublime's.
It's based on the "Mac OS X 10.5+" keymap in PyCharm and has only been tested on OS X.
Copy the xml file into your keymaps directory.
Windows and *NIX systems: /.PyCharm /config/keymaps
Macintosh systems: ~/Library/Preferences/PyCharm40/keymaps