Execute a function in Python when the main application is finished running

README.md

When driver.py finishes running, email.send_email() is executed. This is because in the driver, it is registered in the atexit module:

import atexit
atexit.register(send_email)

which means that when the driver is finished and is about to exit, the send_email() function will be the last thing that runs. In this example send_email() simply prints that it's sending an email, but this is where you should actually email report_obj out.

See this script in action.

driver.py

import sys
from report import report_obj
from email import send_email

# Register the send_email function to run when this program ends
import atexit
atexit.register(send_email)

# Print the original contents of the report_obj message
print('\nOriginal message:')
print('\033[0;34m')
print('===========================')
print(report_obj.message)
print('===========================')
print('\033[m')

# Add a line to the report_obj message
report_obj.message += '\nThis is the second line'

# Print the the new contents of the report_obj message
print('Message after adding a line:')
print('\033[0;34m')
print('===========================')
print(report_obj.message)
print('===========================')
print('\033[m')

email.py

from report import report_obj

def send_email():
	print('\033[0;31m')
	print('Sending email...')
	print('\033[m')

report.py

class Report:
    def __init__(self):
        self.message = 'This is the first line'

report_obj = Report()