Run a python script from within python and also catch the exception

Question

Run a python script from within python and also catch the exception.

File: test1.py

try:
    a = 1/0
except:
    raise

File: test2.py

import subprocess
subprocess.call('python test.py', shell=True)

How can I run test1.py and also catch the ZeroDivisionError in test2.py ?

test1 is a standalone script which is run as cron job with certain arguments. So I wanted to run the script with system arguments without making script a module. — dumper
– dumper, Commented Dec 2, 2014 at 8:12

famousgarkin · Accepted Answer · 2014-12-02 07:32:55Z

3

You can achieve this with exec:

with open('script.py') as f:
    script = f.read()
    try:
        exec(script)
    except ZeroDivisionError as e:
        print('yay!', e)

answered Dec 2, 2014 at 7:32

famousgarkin

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2 Comments

dumper Over a year ago

This works great. But how about you want to execute a perl script within a python.

famousgarkin Over a year ago

@dumper I don't think you can catch a Perl exception from Python. Languages are usually not directly interoperable like this. You should execute non-Python code as a process and check it's return value, e.g. using subprocess.check_call. This is a conventional way of process result communication, when 0 means successful execution and any other status code returned means an error. Of course the executed process should adhere to the convention and return useful status codes.

a.j. tawleed · Accepted Answer · 2014-12-02 07:27:46Z

0

Is there a particular reason why you are using subprocess? I would do it just this way

test1.py

def test
    try:
        a = 1/0
    except:
        raise

test2.py

import test1

try:
    test1.test()
except
    whateveryouwannado

answered Dec 2, 2014 at 7:27

a.j. tawleed

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Comments

Vishnu Upadhyay · Accepted Answer · 2014-12-02 07:30:05Z

0

Use try except and use function call will be better,

test1.py

def solve():
    try:
        a = 1/0
    except ZeroDivisionError as e:
        print e.message
solve()

test2.py

import subprocess
subprocess.call('python foo.py', shell=True)

answered Dec 2, 2014 at 7:30

Vishnu Upadhyay

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