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

[Matthew Turk]

On Tue, Mar 18, 2014 at 12:29 PM, Stuart Mumford <stuart at mumford.me.uk> wrote:
> 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

Yeah, it was designed to avoid lots of sub-imports and to keep it
possible to import individual bits by themselves.  (i.e., importing
without getting matplotlib, which will no longer be possible.)  "mods"
will treat yt more like an application, which means things like
startup_tasks will be run and it will look at command line arguments.

-Matt

>
> 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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