How to return error line in a given file path for python?

Question

I want File1.py to return the error line in File2.py

File1.py:

def find_errors(file_path_of_File2):
    print(f'the error is on line {}')

the error is on line 2

File2.py:

print('this is line 1')
print(5/0)

ZeroDivisionError: integer division or modulo by zero

Is this possible?

Not possible: ZeroDivisionError is a runtime error, not a compile-time error. The only way to know it will be raised is to execute the code, and see it raised. — Amadan
– Amadan, Commented Dec 20, 2018 at 4:05
What's wrong if I executed File2.py through File1.py and saved the output of File2.py (which results in the error) and then returned that error line in File1.py? — HumanTorch
– HumanTorch, Commented Dec 20, 2018 at 4:09
how is the file2 and the file1 are connected. Could you please post full example — Laser
– Laser, Commented Dec 20, 2018 at 4:10
@Arseniy They are 2 separate files. File2.py could be accessed through File1.py like so: stackoverflow.com/questions/1186789/… — HumanTorch
– HumanTorch, Commented Dec 20, 2018 at 4:12

alecxe · Accepted Answer · 2018-12-20 04:26:22Z

3

You can do it a little bit ugly with the traceback module.

File1.py

print('this is line 1')
print(5/0)

File2.py

import sys
import traceback
try:
    import test
except Exception as e:
    (exc_type, exc_value, exc_traceback) = sys.exc_info()
    trace_back = [traceback.extract_tb(sys.exc_info()[2])[-1]][0]
    print("Exception {} is on line {}".format(exc_type, trace_back[1]))

output

this is line 1
Exception <type 'exceptions.ZeroDivisionError'> is on line 2

In this case, you will catch all exceptions raised during importing your file, then you will take the last one from the trace_back.

edited Dec 20, 2018 at 4:26

alecxe

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answered Dec 20, 2018 at 4:25

Laser

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