On Mon, Jan 14, 2019 at 12:36 PM E. Madison Bray <erik.m.b...@gmail.com> wrote:
>
> On Mon, Jan 14, 2019 at 12:00 PM Dima Pasechnik <dimp...@gmail.com> wrote:
> >
> > Turns out it's due to the script reading a parameter, in the usual
> > Pythonic way, at the end of the file:
> >
> > if __name__ == "__main__":
> > import sys
> > m = int(sys.argv[1])
> > compute_alpha(m)
> >
> > Namely, load() tries to evaluate int(sys.argv[1]), whereas for some
> > reason sys.argv[1] is '-i'.
> >
> > So this is probably not a bug, but deserves mentioning in the documentation.
>
> What I'm wondering is why load() sets `__name__ = '__main__'`
> (otherwise it wouldn't be running this code at all).
>
> There might be a good reason, but it also seems like a bad idea
> precisely for reasons like this: .sage files that also work as
> executables, and thus use the standard `__name__ == '__main__'`
> blocking. I don't think load() should cause this code to run. It
> might instead be better if it assigned some random-ish module name
> based on the .sage filename.
perhaps, even better, having `__name__` equal to None by default is a
better choice,
and load() can get an optional parameter to set `__name__` ?
(same with attach())
Dima
>
> > On Mon, Jan 14, 2019 at 10:42 AM Dima Pasechnik <dimp...@gmail.com> wrote:
> > >
> > > My student created a sage script crossing.sage that runs by itself,
> > > i.e. starting it in bash, with it having the 1st line
> > >
> > > #!/usr/bin/env sage
> > >
> > > but an attempt to load("crossing.sage") in Sage gives an error:
> > >
> > > ValueError Traceback (most recent call
> > > last)
> > > <ipython-input-1-f92dbb154243> in <module>()
> > > ----> 1 load("crossing.sage")
> > > /home/dimpase/sage/local/lib/python2.7/site-packages/sage/misc/persist.pyx
> > > in sage.misc.persist.load (build/cythonized/sag
> > > e/misc/persist.c:2470)()
> > > 134
> > > 135 if sage.repl.load.is_loadable_filename(filename):
> > > --> 136 sage.repl.load.load(filename, globals())
> > > 137 return
> > > 138
> > > /home/dimpase/sage/local/lib/python2.7/site-packages/sage/repl/load.pyc
> > > in load(filename, globals, attach)
> > > 261 add_attached_file(fpath)
> > > 262 with open(fpath) as f:
> > > --> 263 exec(preparse_file(f.read()) + "\n", globals)
> > > 264 elif ext == '.spyx' or ext == '.pyx':
> > > 265 if attach:
> > > <string> in <module>()
> > > ValueError: invalid literal for int() with base 10: '-i'
> > > sage:
> > >
> > > ---------------------
> > >
> > > Is this a Sage bug? Any idea what might be going on there?
> > >
> > > Thanks
> > > Dima
> >
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