SyntaxError: from simple python example file from mind-monitor code (muse 2)

[warmcupoftea]

I am working on a project using Muse 2, the brain wave detector. And I found the very simple code by James from mind-monitor.com and the app.
It looks pretty straight forward but somehow my Mac terminal cannot run it. This code should get the data from the app on my ipad/iphone via OSC and shown the visual graph.

I have posted this issue on the forum of https://mind-monitor.com/forums/viewforum.php?f=15
but they suggested I ask someone who knows python more. So here I am.

so..
The github of the example code is here:
https://github.com/Enigma644/MindMonitorPython

The code I'm trying is this one called "OSC Receiver Simple.py", which the URL is here:
https://github.com/Enigma644/MindMonitor...0Simple.py


I had changed the file name since the terminal says it cannot fine 'OSC' alone so I changed it to OSC-Receiver-Simple.py
Then, I got this error:

Error:
 File "OSC-Receiver-Simple.py", line 13
         def eeg_handler(address: str,*args):
                                ^
    SyntaxError: invalid syntax 

NOTE* I can't put code snippet here. IDK why it is always shown as simple text. But anyway, the ^ of the error is shown at : aka colon.

I'm running on Mac
MacBook Pro (Retina, 15-inch, Mid 2014) Catalina 10.15.7
with python python2 2.7 and 3
and I already have that pip and done the "pip install python-osc"

Any suggestion of what might happen?
Thanks in advance.