How to set breakpoint in another module (don't set it on function definition line, if you want to break when function starts being executed)

Question

I’m trying to debug a module “main”, which calls a function “broken_function” at line 356 of “another_module”. I’m having an error in that function and want to put a breakpoint at its start. Below is the listing. Am I doing something wrong? Cause, the breakpoint doesn’t work:

$ python -m pdb main
(Pdb) import sys
(Pdb) sys.path.append("/home/user/path/to/another/module")
(Pdb) import another_module
(Pdb) b another_module:356
Breakpoint 1 at /home/user/path/to/another/module/another_module.py:356
(Pdb) c
Traceback (most recent call last):
...
File "/home/user/path/to/another/module/another_module.py", line 383, in broken_function
f=open("../jobs/temptree.tre", "r")
IOError: [Errno 2] No such file or directory: '../jobs/temptree.tre'
Uncaught exception. Entering post mortem debugging
...

Asked By: Boris Burkov

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Source

Answer 1

You are setting the breakpoint correctly. I imagine it is not stopping because the line of code you are breaking on is not called. Put the break on line 383.

Answered By: Riaz Rizvi

Answer 2

You can also set the breakpoint directly with the file and line number, without having to import either sys or another_module.

(Pdb) b /home/user/path/to/another/module/another_module.py:383
Breakpoint 1 at /home/user/path/to/another/module/another_module.py:383

Note that /home/user/path/to/another/module/another_module.py needs to be imported and line 383 needs executable and in the path of execution for it to break, as others have pointed out.

For more help, type help b (or for that matter help followed by any other command) to get more information on that command.

Answered By: user650654

How to set breakpoint in another module (don't set it on function definition line, if you want to break when function starts being executed)

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