Only allow 1 instance of a python script

Question

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Python: single instance of program

What is the best way to insure that only 1 copy of a python script is running? I am having trouble with python zombies. I tired creating a write lock using open("lock","w"), but python doesn't notify me if the file already has a write lock, it just seems to wait.

score 3 · Accepted Answer · answered Jul 13 '10 at 21:58

3

Try:

import os
os.open("lock", os.O_CREAT|os.O_EXCL)

The documentation for os.open and its flags.

answered Jul 13 '10 at 21:58

ChristopheD

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Worked like a charm, thank you! – rook Jul 13 '10 at 22:01
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This will create a file named `lock`. This file will not be deleted automatically. – Asclepius Feb 20 '13 at 22:08

score 1 · Answer 2 · edited May 23 '17 at 10:32

1

Your question is similar to this one: What is the best way to open a file for exclusive access in Python?. The answers given there should help you with your issue.

(Use the flag combination portalocker.LOCK_EX!|portalocker.LOCK_NB to return quickly. If the file is locked by another process, your script should get an exception.)

edited May 23 '17 at 10:32

Community

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answered Jul 13 '10 at 21:55

David Harris

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Only allow 1 instance of a python script

2 Answers2