CODEWITHSUNDEEP
python
astronautlevel
astronautlevel

Reputation: 488

How to stop a program in Idle, python 3.2

I made a program in Idle that says:

for trial in range(3):
if input('Password:') == 'password':
    break
else:
    # didn't find password after 3 attempts
    **I need a stop program here**
print ("Welcome in")

Remember, this is in Idle, so I need program for Idle, not CMD. I also am using Python 3.2, if that helps.

Upvotes: 1

Views: 4368

Answers (5)

Rufus McLeod-Williams
Rufus McLeod-Williams

Reputation: 1

I tried sys.exit() and it highlights 'sys' as INVALID SYNTAX.

It might be something to do with how I'm doing it, but if that's the case, then IDK then.

Upvotes: 0

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250951

use sys.exit() or raise SystemExit

import sys
for trial in range(3):
    if input('Password:') == 'password':
        break
else:
    sys.exit()
print ("Welcome in"))

Edit: To end it silently wrap it in a try-except block:

try:
    import sys
    for trial in range(1):
        if raw_input('Password:') == 'password':
            break
    else:
        raise SystemExit #or just sys.exit()
    print ("Welcome in")
except SystemExit:
    pass  #when the program throws SysExit do nothing here,i.e end silently

Upvotes: 2

Jeff Mercado
Jeff Mercado

Reputation: 134841

A much nicer way to do this IMHO would be to put your program into a function and return when you want it to stop. Then just call the function to run your program.

def main():
    for trial in range(3):
        if input('Password:') == 'password':
            break
    else:
        return
    print ("Welcome in")

main()

Upvotes: 4

poke
poke

Reputation: 387667

sys.exit can exit a program at any time.

Upvotes: 1

Zac B
Zac B

Reputation: 4232

I'm unsure what you mean by "in IDLE" vs "in CMD". A Python shell launched by IDLE should be able to be terminated the same way as a Python shell launched from the commandline.

Also, the tabs in your example appear to be wrong: everything below for... and above print... should be indented.

On to your question: are you asking for a command that terminates your script at that point? If so, adding the two lines from sys import exit and then calling exit() should do the trick, though it will raise a SystemExit exception. If you don't like that, you can add a pass handler for the SystemExit exception type at the outer layer of your program.

Upvotes: 1

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