system exit in python code example

Example 1: why doesn't sys.exit work?

import sys

try:
    sys.exit() # this always raises SystemExit
except SystemExit:
    print("sys.exit() worked as expected")
except:
    print("Something went horribly wrong") # some other exception got raised

Example 2: python system exit

import sys 
age = 17
if age < 18: 
    sys.exit("Age less than 18")     
else: 
    print("Age is not less than 18")

Example 3: python system exit

import sys

sys.exit(0)