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

[Guido van Rossum]

Yeah, I like the idea, but I don't like the debug() name -- IIRC there's a
helper named debug() in some codebase I know of that prints its arguments
under certain circumstances.

On Tue, Sep 5, 2017 at 7:58 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Tue, Sep 5, 2017 at 6:14 PM, Barry Warsaw <barry at python.org> wrote:
> > I’ve written a PEP proposing the addition of a new built-in function
> called debug().  Adding this to your code would invoke a debugger through
> the hook function sys.debughook().
>
> The 'import pdb; pdb.set_trace()' dance is *extremely* obscure, so
> replacing it with something more friendly seems like a great idea.
>
> Maybe breakpoint() would be a better description of what set_trace()
> actually does? 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 set_trace().)
>
> Example:
>
> In [1]: def f():
>    ...:     x = 1
>    ...:     raise RuntimeError
>    ...:
>
> In [2]: f()
> ------------------------------------------------------------
> ---------------
> RuntimeError                              Traceback (most recent call last)
> <ipython-input-2-0ec059b9bfe1> in <module>()
> ----> 1 f()
>
> <ipython-input-1-db0dc90ff5b9> in f()
>       1 def f():
>       2     x = 1
> ----> 3     raise RuntimeError
>
> RuntimeError:
>
> In [3]: debug
> > <ipython-input-1-db0dc90ff5b9>(3)f()
>       1 def f():
>       2     x = 1
> ----> 3     raise RuntimeError
>
> ipdb> p x
> 1
>
> -n
>
> --
> Nathaniel J. Smith -- https://vorpus.org
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-- 
--Guido van Rossum (python.org/~guido)
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