Another useful tip which doesn't require always doing '00': when editing the library code, import things like this: import mylib; importlib.reload(mylib);

Another useful tip which doesn't require always doing '00': when editing the library code, import things like this: import mylib; importlib.reload(mylib); from mylib import foo Then in most cases except some very entangled ones, you can simply rerun this cell without having to restart the kernel (especially if it requires reloading all the data).