What is the deeper meaning of the Exit() function in vpython.py line 18 to 22 in vpython 7.6.4

Question

The Exit() function in module vpython.py in vpython 7.6.4 is implemented as follows and registered with atexti:

def Exit():
    zero = 0.
    print('exit')
    a = 1.0/zero

import atexit
atexit.register(Exit)

What is the deeper meaning of this code?

Kind regards

Klaus