How can I have a python script safely exit itself?

Question

Heres the scenario I have a password that must be entered if entered wrong the script will not proceed and just exit itself? But how can I tell the script to safely exit itself?

I tried sys.exit() but that gives a traceback error and doesn't seem like a very clean exit method.

Was the error NameError: global name 'sys' is not defined? Calling sys.exit() exits cleanly for me. — Abe Karplus
– Abe Karplus, Commented Aug 3, 2012 at 3:02
The traceback error only exists in IDLE, that is the correct way to exit a program. — Josiah
– Josiah, Commented Aug 3, 2012 at 3:02
@Josh Will do sorry about im still getting use to this awesome website! — harry
– harry, Commented Aug 3, 2012 at 3:17
Oh right, one more thing. The reason that exists in IDLE is because IDLE catches and traces all exceptions, and sys.exit() throws an exception. This won't be that big of a deal for you unless you try to put it into a try: except: pass (which is bad practice anyways) where it will fail to exit the program. — Josiah
– Josiah, Commented Aug 3, 2012 at 3:21
@l4mpi No, it is slightly different. sys.exit is a <built-in function exit>, but exit is a <class 'site.Quitter'> object. — glglgl
– glglgl, Commented Jun 25, 2013 at 16:59

rafa · Accepted Answer · 2013-06-25 16:23:58Z

2

In fact, sys.exit() will only throw a SystemExit exception, which would make the program exit if this exception wasn't catched, but I don't think it's poor coding.

Anyway, another possibility is to use os._exit(0) if you need to exit immediately at any cost. (cf. http://docs.python.org/2/library/exceptions.html#exceptions.SystemExit)

answered Jun 25, 2013 at 16:23

rafa

8051 gold badge11 silver badges26 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mohamed Benkedadra · Accepted Answer · 2019-11-09 15:09:10Z

1

you are using the sys module, but you haven't imported it.

add this before the sys.exit() line :

import sys

edited Nov 9, 2019 at 15:09

Mohamed Benkedadra

2,0945 gold badges24 silver badges51 bronze badges

answered Nov 9, 2019 at 14:35

iammgt

431 silver badge10 bronze badges

Collectives™ on Stack Overflow

How can I have a python script safely exit itself?

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related