Type hint produces Syntax error

[Digamma]

Thanks !

(venv) [...]>python -c "import sys; print(sys.executable)"
[...]\venv\Scripts\python.exe

(venv) [...]>pip -V
pip 9.0.1 from [...]\venv\lib\site-packages\pip-9.0.1-py3.7.egg (python 3.7)

(venv) [...]>python -V
Python 3.7.0b3

(venv) [...]>venv\Scripts\python.exe type_hint_test.py

(venv) [...]> Thanks !

The venv is really based on python 3.7 but I wasn't using it to start the script.