[Python-Dev] PEP 553: Built-in debug() (original) (raw)

Guido van Rossum guido at python.org
Wed Sep 6 13:19:48 EDT 2017

99% of the time I use a debugger I use pdb.set_trace(). The pm() stuff is typically useful for debugging small, simple programs only -- complex programs likely hide the exception somewhere (after logging it) so there's nothing for pdb.pm() to look at. I think Barry is wisely focusing on just the ability to quickly and programmatically insert a breakpoint.

On Wed, Sep 6, 2017 at 10:00 AM, Nathaniel Smith <njs at pobox.com> wrote:

On Wed, Sep 6, 2017 at 7:39 AM, Barry Warsaw <barry at python.org> wrote: >> On Tue, Sep 5, 2017 at 7:58 PM, Nathaniel Smith <njs at pobox.com> wrote: >> This would also avoid confusion with IPython's very >> useful debug magic: >> https://ipython.readthedocs.io/en/stable/interactive/ magics.html#magic-debug >> and which might also be worth stealing for the builtin REPL. >> (Personally I use it way more often than settrace().) > > Interesting. I’m not an IPython user. Do you think its %debug magic would benefit from PEP 553?

Not in particular. But if you're working on making debugger entry more discoverable/human-friendly, then providing a friendlier alias for the pdb.pm() semantics might be useful too? Actually, if you look at the pdb docs, the 3 ways of entering the debugger that merit demonstrations at the top of the manual page are: pdb.run("...code...") # "I want to debug this code" pdb.settrace() # "break here" pdb.pm() # "wtf just happened?" The settrace() name is particularly opaque, but if we're talking about adding a friendly debugger abstraction layer then I'd at least think about whether to make it cover all three of these. -n -- Nathaniel J. Smith -- https://vorpus.org

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