[Python-Dev] What's the best way to debug python3 source code? (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Mon Jun 18 08:16:07 CEST 2012

What's the best way to debug python3 source code? To fix a bug i need to debug source code(C files). I use gdb to debug.

If the bug is presumably in C, then using gdb works fine for me.

But how can i get the exact file/point to fix the bug?

As usual: set breakpoints and watch points. In some cases, also augment the C code to print out trace messages. Use the excellent python-gdb.py, which requires a recent gdb version.

How can i know quickly where the bug is?

The fastest way is probably Linus Torvald's approach: just look at the code for 20 seconds, and see the bug without running the code. YMMV.

How can i run python>>> from gdb and giving input there how can i test and debug to fix a bug?

If you start Python in gdb, then do "r", it will automatically start interactive mode.

Someone please explain/elaborate the process you use/do as usual with examples.

I wasn't quite sure whether your question is off-topic for python-dev: this last request definitely is. python-dev is not a place to get free education. Instead, it is a place where you contribute to Python. If you work on a specific bug and have a specific question about it, feel free to ask. However, "teach me how to debug" is best asked on other mailing lists.

Regards, Martin

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