ReachView Flask's log output file

Wondering where is the Flask’s web server output the print() statements in the python code?

Example

@socketio.on(“update reachview”, namespace="/test")
def updateReachView():
print(“Got signal to update!!!”)
print(“Server interrupted by user to update!!”)

I looked in /var/log/… but didn’t find anything

The only way I’ve seen them is to kill the server.py script and then:
cd /home/reach/ReachView sudo python server.py
and watch them go by in the terminal window.