python.py

# my_module/
# 	__init__.py
# 	Helpers/
# 		__init__.py
# 		plist_helper.py
# 	Foo/
# 		__init__.py
# 		foo.py
# 		Bar/
# 			__init__.py
# 			bar.py
# 			Bazz/
# 				__init__.py
# 				bazz.py
#
# From 'bazz.py' I want to import 'plist_helper.py', how do i do this?

from ....Helpers import plist_helper

(but already told you this on IRC :D)