Here is a simple trick that I used to restart my python script after unhandled exception.
Let’s say I have this simple script called test.py that I want to run forever. It will just wait 2 seconds and throw an error.
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import time time.sleep(2) raise Exception("Oh oh, this script just died") |
I use the following script called forever in the same directory:
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#!/usr/bin/python from subprocess import Popen import sys filename = sys.argv[1] while True: print("\nStarting " + filename) p = Popen("python " + filename, shell=True) p.wait() |
It uses python to open test.py as a new subprocess. It does so in an infinite while loop, and whenever test.py fails, the while loop restarts test.py as a new subprocess.
I’ll have to make the forever script executable by running chmod +x forever. Optionally forever script can be moved to some location in the PATH variable, to make it available from anywhere.
Next, I can start my program with:
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./forever test.py |
Which will result in the following output:
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Starting test.py Traceback (most recent call last): File "test.py", line 4, in <module> raise Exception("Oh oh, this script just died") Exception: Oh oh, this script just died Starting test.py Traceback (most recent call last): File "test.py", line 4, in <module> raise Exception("Oh oh, this script just died") Exception: Oh oh, this script just died Starting test.py |
As you can tell, this script will run repeatedly, until it is killed with ctr+c.
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