atexit - Exit handlers

• It performs cleanup after the interpreter exits.
• It has two functions:

1. register()

• It takes a function as an argument to be executed when the interpreter exits. Execution takes place on a LIFO.

""" Output: Goodbye
"""
from atexit import register

@register
def goodbye():
  print("Goodbye")

2. unregister()

• After calling unregister(), <function_name> is guaranteed not to be called when the interpreter shuts down, even if it was registered more than once.

"""Output: No output
"""
from atexit import unregister

names = ['Bob', 'Mike', 'Alice']
  
def hello(name):
  print(name)
  
for name in names:
  atexit.unregister(hello)