Line number in Python exception [duplicate]

Question

How to get line number of exception in Python?

The output of the following code

try:
    print("a" + 1)
except Exception as error_message:
    print("There was an error: " + str(error_message))

is

There was an error: can only concatenate str (not "int") to str

But instead of just printing the

"There was an error: " + str(error_message)

how to print the line number as well like this example

try:
    print("a" + 1)
except Exception as error_message and linenumber as linenumber:
    print("There was an error: " + str(error_message) + ". The line where the code failed was " + str(linenumber))

with the expected output of

There was an error: can only concatenate str (not "int") to str. The line where the code failed was 2

This would be really useful for me when debugging my projects

I know there are similar question out there, but I couldn't find a solution by looking or trying them out. — root
– root, Commented Feb 13, 2021 at 16:20
You might want to look at the standard way of formatting tracebacks: docs.python.org/3/library/traceback.html — deceze
– deceze ♦, Commented Feb 13, 2021 at 16:22
use traceback module. U can try traceback.print_tb(error_message.__traceback__) — SURYA TEJA
– SURYA TEJA, Commented Feb 13, 2021 at 16:34

craftman2868 · Accepted Answer · 2021-02-13 16:27:16Z

7

import traceback

try:
    print("a" + 1)
except Exception as e:
    print("There was an error: " + e.args[0] + ". The line where the code failed was " + str(traceback.extract_stack()[-1][1]))

answered Feb 13, 2021 at 16:27

craftman2868

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6 Comments

Amit Verma Over a year ago

While this code may provide a solution to the question, it's better to add context as to why/how it works. This can help future users learn and eventually apply that knowledge to their own code. You are also likely to have positive-feedback/upvotes from users, when the code is explained.

NeilG Over a year ago

This doesn't work. It seems to report the line where the exception was caught, not where it was raised.

SpicyCatGames Over a year ago

@NeilG just do traceback.print_exc()

NeilG Over a year ago

That's what everyone says @SpicyCatGames. I don't know why everyone automatically thinks everyone wants to print to console. I don't. I want to capture the error information in my own structures so I can report it later.

NeilG Over a year ago

@SpicyCatGames, I want the separate pieces so I can manipulate them and apply custom formatting. I found the associated "duplicate" question referred to above provided better answers: stackoverflow.com/questions/1278705/…

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