How to get the line number on which exception or error occurred in Python?

Question

I have a Django ORM query like this:

try:
    specialization_object = Specialization.objects.get(name="My Test Specialization")
except Exception as ex:
    print(ex)

When there occurs an exception then it prints "Specialization matching query does not exist.", but it does not print the line number. How can I trace the line number on which the exception or error occurred?

use `sys.exc_info()` https://docs.python.org/3/library/sys.html#sys.exc_info — Håken Lid, Jun 05 '18 at 09:00
But in this case the subsequent lines won't be executed. I want to handle the exception and also get the exception line number. — Taohidul Islam, Jun 05 '18 at 09:01

sudonym · Answer 1 · 2018-06-05T09:03:51.363

3

try this:

import logging
logger = logging.getLogger(__name__)

try:
    specialization_object = Specialization.objects.get(name="My Test Specialization")
except Exception as ex:
    logger.info(ex, exc_info=True) # exc_info will add traceback

further reading see here

edited Jun 05 '18 at 09:03

answered Jun 05 '18 at 09:00

sudonym

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mea culpa - just switched to logging :/ – sudonym Jun 05 '18 at 09:04
print(ex, exc_info=True) shows that exc_info is is unexpected argument here. – Taohidul Islam Jun 05 '18 at 09:05
1

Or just `logger.exception(message)`. – Alex Hall Jun 05 '18 at 09:07

score 2 · Answer 2 · answered Jun 05 '18 at 09:36

2

If you can't for any reason use logging, There's the standard package traceback, and you can do something like:

traceback.print_exc(file=sys.stdout)

answered Jun 05 '18 at 09:36

Lohmar ASHAR

1,639
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score 1 · Accepted Answer · answered Jun 05 '18 at 09:42

1

I have figured out a simple solution just now:

import traceback
try:
    specialization_object = Specialization.objects.get(name="My Test Specialization")
except Exception as ex:
    print(traceback.format_exc())

answered Jun 05 '18 at 09:42

Taohidul Islam

5,246
3
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How to get the line number on which exception or error occurred in Python?

3 Answers3