[yt-dev] Importing yt versus importing yt.mods

[Stuart Mumford]

What are the key things that `yt.mods` will do that `yt` will not under
this model? As a new user I did find the yt.mods thing a little strange. :p

Stuart


On 18 March 2014 14:20, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi all,
>
> Some of this was hashed out before on the YTEP-0019 discussion, but I
> am going through and re-implementing some of that now and I wanted to
> bring it back to the group.
>
> What we had come up with was:
>
>  * import yt => gets most of the items used in yt in the main namespace
>  * import yt.mods => treats yt more like an application, gets
> everything but *also* does "startup tasks"
>
> Now, the big benefit to making it like this is that you can do:
>
> import yt
>
> and get everything.  The *downside* is that we will no longer be able to
> do:
>
> import yt.something.something_else
>
> and *avoid* importing all of yt.  I've experimented with the import
> times and came up with this.  All times were computed by running 10
> cycles, dividing total time by 10.
>
>  * 2.6 (current @ bookmark) => 0.45s per import
>  * 3.0, "development" => 0.47s per import
>  * My YTEP-0019 bookmark => 0.97s per import
>  * Import numpy and matplotlib => 0.22s per import
>  * Importing numpy, matplotlib, *and* sympy => 0.78s per import
>
> So I think we're doing okay on import times, although I must confess
> when I initial ran it and saw how slow importing the unitrefactor
> branch was I was a bit worried.  But most of that is sucked up into
> numpy, matplotlib and sympy.  I guess it's not so bad.
>
> Here's my PR:
>
> https://bitbucket.org/yt_analysis/yt/pull-request/729/ytep-0019/diff
>
> (bookmark: ytep0019, which I will delete later.)
>
> -Matt
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