[Python-Dev] PEP 553; the interaction between $PYTHONBREAKPOINT and -E

Guido van Rossum guido at python.org
Wed Oct 4 14:14:58 EDT 2017

Treating -E as PYTHONBREAKPOINT=0 makes sense.

On Wed, Oct 4, 2017 at 11:06 AM, Barry Warsaw <barry at python.org> wrote:

> Victor brings up a good question in his review of the PEP 553
> implementation.
> https://github.com/python/cpython/pull/3355
> https://bugs.python.org/issue31353
> The question is whether $PYTHONBREAKPOINT should be ignored if -E is given?
> I think it makes sense for $PYTHONBREAKPOINT to be sensitive to -E, but in
> thinking about it some more, it might make better sense for the semantics
> to be that when -E is given, we treat it like PYTHONBREAKPOINT=0, i.e.
> disable the breakpoint, rather than fallback to the `pdb.set_trace` default.
> My thinking is this: -E is often used in production environments to
> prevent stray environment settings from affecting the Python process.  In
> those environments, you probably also want to prevent stray breakpoints
> from stopping the process, so it’s more helpful to disable breakpoint
> processing when -E is given rather than running pdb.set_trace().
> If you have a strong opinion either way, please follow up here, on the PR,
> or on the bug tracker.
> Cheers,
> -Barry
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--Guido van Rossum (python.org/~guido)
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