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The embedding machinery ignores user_ns #1136

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g2p opened this Issue · 6 comments

3 participants

@g2p
g2p commented

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
@takluyver
Owner

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.

@fperez
Owner

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...

@takluyver
Owner

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.

@fperez
Owner

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

@takluyver
Owner

Have a look at PR #1140.

@takluyver
Owner

Merged PR #1140, which resolves this.

@takluyver takluyver closed this
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