nb_event undefined in systematics.py

[Zachary Marshall]

Hi,

In the run(self, stdout=sys.stdout) function in systematics.py , there's a sequence that looks like this:

        for nb_event,event in enumerate(self.input):
            stuff()
        else:
            self.output.write('</LesHouchesEvents>\n')
        self.output.close()
        self.print_cross_sections(all_cross, min(nb_event,self.stop_event)-self.start_event+1, stdout)

In the case that self.input is an empty list, nb_event is not defined, and the job crashes. It's a weird situation in which that happens, but it could be handled with a quick and easy error message to avoid the crash.

Thanks,
Zach

[Olivier Mattelaer (olivier-mattelaer)]

Well, in that case we should have a crash (but ok we might one a clear one).
Do you have a reason to not have a crash here?

Cheers,

Olivier

> On 24 Jan 2020, at 07:12, Zachary Marshall <email address hidden> wrote:
>
> Public bug reported:
>
> Hi,
>
> In the run(self, stdout=sys.stdout) function in systematics.py , there's
> a sequence that looks like this:
>
> for nb_event,event in enumerate(self.input):
> stuff()
> else:
> self.output.write('</LesHouchesEvents>\n')
> self.output.close()
> self.print_cross_sections(all_cross, min(nb_event,self.stop_event)-self.start_event+1, stdout)
>
> In the case that self.input is an empty list, nb_event is not defined,
> and the job crashes. It's a weird situation in which that happens, but
> it could be handled with a quick and easy error message to avoid the
> crash.
>
> Thanks,
> Zach
>
> ** Affects: mg5amcnlo
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1860747
>
> Title:
> nb_event undefined in systematics.py
>
> Status in MadGraph5_aMC@NLO:
> New
>
> Bug description:
> Hi,
>
> In the run(self, stdout=sys.stdout) function in systematics.py ,
> there's a sequence that looks like this:
>
> for nb_event,event in enumerate(self.input):
> stuff()
> else:
> self.output.write('</LesHouchesEvents>\n')
> self.output.close()
> self.print_cross_sections(all_cross, min(nb_event,self.stop_event)-self.start_event+1, stdout)
>
> In the case that self.input is an empty list, nb_event is not defined,
> and the job crashes. It's a weird situation in which that happens, but
> it could be handled with a quick and easy error message to avoid the
> crash.
>
> Thanks,
> Zach
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1860747/+subscriptions