name exit is not defined in python

Question

The following is the code. When I run, I got an error message, saying that "name exit is not defined". Could anyone tell me why? Thanks very much for your time and attention.

if len(sys.argv) == 4:
   ### do something
    pass
else:
    print
    "usage: #### something here"
    exit(-1)

Just import sys, like this: from sys import exit; import sys — felipsmartins
– felipsmartins, Commented May 9, 2015 at 20:54
you're using sys.argv, so clearly, you've imported sys. So just do sys.exit — inspectorG4dget
– inspectorG4dget, Commented May 9, 2015 at 20:55
A quick question. I run it earlier with a super computer, and it works. But today I run it in my PC with canopy, it gives me an error like that. Does anyone know why ? — study
– study, Commented May 9, 2015 at 22:36
Does this answer your question? NameError: name 'exit' is not defined — Hamza Zubair
– Hamza Zubair, Commented Sep 2, 2022 at 10:53

tuomastik · Accepted Answer · 2017-10-05 10:28:37Z

6

If you imported sys then use sys.exit(0) - change 0 with any result code you want to exit with. I had the same issue that before compilation when running from .py file exit(0) worked well but after compiling to .exe it gave me an error. I had to change exit(0) to sys.exit(0) and it worked.

edited Oct 5, 2017 at 10:28

tuomastik

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answered Oct 5, 2017 at 9:48

user3760296

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1 Comment

Synetech Over a year ago

Bingo! Something about compiling complicates it; adding the sys. resolves that.

khampson · Accepted Answer · 2015-05-09 21:00:11Z

5

You need to import sys first, since exit (and argv) is in that module.

The error I get when I run your code is:

File "", line 1, in NameError: name 'sys' is not defined

which is complaining about sys.argv instead of exit. But in either case, the solution -- import sys is the same.

edited May 9, 2015 at 21:00

answered May 9, 2015 at 20:53

khampson

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2 Comments

coder.in.me Over a year ago

Actually, even without import sys the exit command works in terminal. But when I'm running the same script from within Jupyter notebook, I need the import. Not sure why?

rjurney Over a year ago

I can't get exit to work anywhere in a running Python3 program even if I import sys.

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