Skip to content
Related Articles

Related Articles

Improve Article
Detect script exit in Python
  • Last Updated : 12 Nov, 2020

Python is a scripting language. This means that a Python code is executed line by line with the help of a Python interpreter. When a python interpreter encounters an end-of-file character, it is unable to retrieve any data from the script. This EOF(end-of-file) character is the same as the EOF that informs the end of the file while reading data from a file in Python.

To detect a script exit, we can use the built-in the atexit library of Python. The atexit module is used to register or unregister functions that handle clean-up. The functions that are registered by atexit are automatically called at interpreter termination.

Syntax: atexit.register(fun, *args, **kwargs)

Parameters: First the function name is mentioned and then any arguments for that function is passed. The parameters are separated using ‘, ‘.

Return: This function returns the called fun and hence the calling can be traced.

The following example demonstrates how atexit can be used to detect script exit:

Python3




import atexit
  
n = 2
print("Value of n:",n)
  
atexit.register(print,"Exiting Python Script!")

Output:

Value of n: 2
Exiting Python Script!

In this simple program, we passed a print function and a string as arguments to atexit.register function. This registered the print statement as a function that will be invoked on script termination.



We can also use register() method as a decorator.

Python3




import atexit 
  
n = 2
print("Value of n:",n)
  
# Using register() as a decorator 
@atexit.register 
def goodbye(): 
    print("Exiting Python Script!")

Output:

Value of n: 2
Exiting Python Script!

Python provides various functions that can be used to exit a python script, you can check them here. 

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course




My Personal Notes arrow_drop_up
Recommended Articles
Page :