Change linenumber and filename printed in exceptions like #line in C

[kryptomatrix]

Hi,
As you might know, there is the #line command in the C-preprocessor:

#include <stdio.h>
#line 20 "abc"
int main() {
    printf("%i %s\n", __LINE__, __FILE__); //outputs 22 abc
}

Is there something like this #line command in python? I want to change what is printed in exceptions.
I tried:

import inspect
frame = inspect.currentframe()
fileNo = frame.f_lineno
frame.f_lineno=1000

But this resulted in the output

Output:
Traceback (most recent call last):
  File "pythontest.py", line 4, in <module>
    frame.f_lineno=1000
ValueError: f_lineno can only be set by a trace function

In case you were wondering why I would want to change the filename and filenumber: In my workflow, I have a files that contain python source code and other text. A script searches those python source code blocks, puts them into the right order, writes them into a file (called sum.py) and executes this file. This works fine, but obviously exceptions show the linenumber in sum.py and not the linenumber in the original files.

[Larz60+]

They're called dunders (double underscore) in python list here: https://docs.python.org/3/reference/impo..._#__name__
for exceptions, you can examine the call stack
see: https://python-forum.io/Thread-Walking-t...ight=stack

[Gribouillis]

I don't think there is any equivalent of the #line preprocessing directive in python. What you could do is catch the exception and transform the output of traceback.format_tb() by replacing items such as ['File "sum.py" line 10 ...'] with the correct line and file reference. This supposes that you store these position informations in a separate file when you create sum.py.