The embedding machinery ignores user_ns #1136

g2p opened this Issue Dec 9, 2011 · 6 comments


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3 participants

g2p commented Dec 9, 2011

Quick demonstration:

from IPython import embed

user_ns = dict(cookie='monster')
embed(user_ns=user_ns, banner1='Please type: cookie')

Bisecting shows the last good revision was 5397fc8, the following revisions don't have working embedding until 9a2ec9f, which has embedding but lost user_ns functionality.
I don't know how to write automated tests for embedding (can stdin be hijacked?).
Paging @takluyver.

@takluyver takluyver was assigned Dec 10, 2011
IPython member

I think I see the issue. user_ns when we create the shell is overridden by local_ns when we activate it. I'll think about the best way to resolve it.

IPython member

This looks pretty serious, I really would hate for 0.12 to come out with broken embedding, seeing as it will be the ubuntu LTS ipython...

IPython member

Right, there are four possibilities for each of user_ns and user_module when embedding:

  1. Not specified at instantiation or activation - use the auto-detected namespace/module at activation
  2. Specified at instantiation only - use that, and do not auto-detect (this is what we're getting wrong)
  3. Specified at activation only - use that, don't auto-detect
  4. Specified at instantiation and activation - what's specified at activation overrides what's specified at instantiation.

I've got an idea how to resolve this. I'll put together a PR, hopefully this evening.

IPython member

Funny coincidence: #136 and this (#1136) are both on scoping problems with the embedding code :)

IPython member

Have a look at PR #1140.

IPython member

Merged PR #1140, which resolves this.

@takluyver takluyver closed this Dec 13, 2011
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