On Thu Dec 18 2014 at 1:33:08 PM Jeroen Demeyer <jdeme...@cage.ugent.be>
wrote:
> I think the error message is clear enough, you shouldn't be resolving
> lazy imports on Sage startup.
Thanks for the reply. I'm afraid that it's not quite clear enough for me
which I think probably means my understanding of it isn't good enough :)
> Usually, lazy imports are used to limit
> the amount of imports done at Sage startup. So if a lazy import is used
> during Sage startup, that's usually a bug.
>
I don't quite understand what you mean by the above: if the point of lazy
import is to limit imports at Sage startup am I not supposed to use it at
Sage startup?
>
> Now the underlying problem is that you use is_package_installed() in
> code which is executed on startup. I suggest you try to refactor your
> code to avoid the use of is_package_installed (for example, use
> try:/except ImportError: instead).
>
We've managed to remove the error message by running:
lazy_import('sage.misc.package', 'is_package_installed', at_startup=True)
but I think you're saying that this is not the right way to go...
I think that I understood elsewhere that using `is_package_installed` is
preferred over try/except statements...
Am I missing some documentation somewhere that would clarify would fix my
lack of understanding :) (Apologies if this is something I should have
already read).
Thanks for the help,
Vince
> On 2014-12-18 12:44, Vincent Knight wrote:
> > Resolving lazy import is_package_installed during startup
>
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