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, May 09 '15 at 20:54
you're using `sys.argv`, so clearly, you've imported `sys`. So just do `sys.exit` — inspectorG4dget, May 09 '15 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, May 09 '15 at 22:36

khampson · Accepted Answer · 2015-05-09T21:00:11.290

6

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 09 '15 at 21:00

answered May 09 '15 at 20:53

khampson

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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? – coder.in.me Sep 20 '16 at 15:24
I can't get exit to work anywhere in a running Python3 program even if I import sys. – rjurney Apr 25 '17 at 03:21

score 5 · Answer 2 · edited Oct 05 '17 at 10:28

5

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 05 '17 at 10:28

tuomastik

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answered Oct 05 '17 at 09:48

user3760296

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Bingo! Something about compiling complicates it; adding the `sys.` resolves that. – Synetech Dec 31 '19 at 18:38

name exit is not defined in python

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