SyntaxError on modules inport

[Nekham]

Installing as suggested by the documentation on python27 and virtualenv
every switch i use on the script, it returns this error:
$ python src/Py/axesscleaner.py -h
Traceback (most recent call last):
File "src/Py/axesscleaner.py", line 3, in
import modules as md
File "/opt/axesscleaner/src/Py/modules.py", line 543
count_open: int = 0 # counts the open-separators
^
SyntaxError: invalid syntax

Maybe it's a configuration mistake that i made, but i have do literally all steps; they are rather symple.