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Python standard library: atexit

atexit provides the two functions:

register adds a function to a list of functions to be called when the Python script terminates
unregister removes a function from this list

The registered functions are not called when

the script is killed
the script calls os._exit
a fatal internal error stops the interpreter

import atexit
import time
from datetime import datetime

def the_end():
    print('the end has come.')

atexit.register(the_end)

for i in range(10):
    time.sleep(1)
    print( 10.0 / (i-5) )

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1745040963, '3.22.66.60', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/languages/Python/standard-library/atexit(58): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

Python standard library: atexit

See also