I was not precise enough. I work on plugin and there are bunch of py files in folder, and all have pyc version.
So I wish, that If I change one or 2 py files, blender would recognize them and recompile appropriate pyc files.
Is that possible to do, without colosing blender and deleting manually all pyc files (it forces blender to recompile all plugin scripts on next start) ?
if "bpy" in locals():
from . import properties
from . import ui
from . import operators
from . import export
“Python source code is automatically compiled into Python byte code by the CPython interpreter. Compiled code is usually stored in PYC (or PYO) files, and is regenerated when the source is updated, or when otherwise necessary.” http://effbot.org/zone/python-compile.htm
This behavior is little different with blender though. Make sure you add the imp.reload stuff (see above) as well as register and unregister functions (e.g. bpy.utils.register_module)
When you updated .py code, hit F8 in Blender and it will reload all addons!