[issue30623] python-nightly import numpy fails since recently

[Ned Deily]

Changes by Ned Deily :


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resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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[issue30623] python-nightly import numpy fails since recently

[Thomas Caswell]

Thomas Caswell added the comment:

https://github.com/python/cpython/pull/1236 has been merged, I believe this 
issue can be closed.

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[issue30623] python-nightly import numpy fails since recently

[R. David Murray]

R. David Murray added the comment:

There is a possible future in which the development style is based around 
continuous integration with third parties, where we apply our backward 
compatibility policy even to changes from one commit to the next within our 
development cycle.  I think that possible future is interesting, but is 
non-trivial to accomplish, and represents a cultural shift that we'd need to 
commit to.

If we go there then, as I believe was touched on at the language summit, actual 
python official releases would become less significant events :)

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[issue30623] python-nightly import numpy fails since recently

[Arek Bulski]

Arek Bulski added the comment:

Thank you, I will temporarily remove the numpy unit test from the 3.7 until
I get notification that it was fixed.

sob., 10 cze 2017 o 22:48 użytkownik STINNER Victor 
napisał:

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> Changes by STINNER Victor :
>
>
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[issue30623] python-nightly import numpy fails since recently

[STINNER Victor]

Changes by STINNER Victor :


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[issue30623] python-nightly import numpy fails since recently

[Nathaniel Smith]

Nathaniel Smith added the comment:

@Arek: It's great that you're testing your code against the latest 3.7 
pre-release, because that helps give early warning of issues in CPython as its 
developed, which helps everyone. BUT, you really cannot expect to use 
in-development versions and expect everything to be perfectly supported and 
work well together all the time -- we need time and space to work things out 
and coordinate. If you can't tolerate failures in your 3.7-prerelease builds, 
then you should remove them from you CI entirely and wait for the final release 
(or at least sometime in the beta/rc period).

Anyway-

Numpy bug here: https://github.com/numpy/numpy/issues/9227

This CPython PR is also relevant: https://github.com/python/cpython/pull/1236

Basically the bug is that numpy just made a release (1.13.0) which assumed that 
if it's running on some version of 3.7, then that PR is surely merged. But it 
turns out that that PR is not yet merged.

We'll probably need to make the usual emergency x.x.1 release in a few days 
anyway, and the simplest fix would be to switch back to the underscore-prefixed 
versions then. But... this needs a bit of coordination, because if we do that 
then the same thing will happen again at some point when that PR is merged; the 
problem here is that numpy was trying to avoid that breakage and thus created 
different breakage :-).

My suggestion would be that NumPy go ahead with releasing a fixed version ASAP, 
and *also* that CPython PR 1236 add back-compat for the underscore-prefixed 
versions. And maybe that it be merged soon if it's easy and going to happen 
anyway, since that will retroactively unbreak 1.13.0.

Bigger picture: I guess there's some irony that I warned that testing against 
prereleases can get complicated at the language summit based on numpy's 
experience, and now it's numpy's fault that cpython is getting grumpy users 
filing bugs at it... sorry about that. It's a useful data point though that we 
should keep in mind, that if we're encouraging people to test prereleases, then 
what used to be a temporary breakage that no-one would notice can actually 
cause more problems now – again, if numpy hadn't broken this now, PR 1236 would 
have at some point, and with the same results. (In the past it's been common 
that numpy just doesn't support a new python release until a month or two after 
it comes out! Apparently those days have passed...)

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nosy: +brett.cannon, haypo

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[issue30623] python-nightly import numpy fails since recently

[Arek Bulski]

Arek Bulski added the comment:

Oh good point, but when I submitted this on TravisCI issues they pointed me
to here.
And this is a highest priority bug.

sob., 10 cze 2017 o 21:02 użytkownik Jelle Zijlstra 
napisał:

>
> Jelle Zijlstra added the comment:
>
> Sounds like the issue is with numpy, not CPython, so there's little reason
> to keep this CPython bug open.
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[issue30623] python-nightly import numpy fails since recently

[Jelle Zijlstra]

Jelle Zijlstra added the comment:

Sounds like the issue is with numpy, not CPython, so there's little reason to 
keep this CPython bug open.

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[issue30623] python-nightly import numpy fails since recently

[Arek Bulski]

Arek Bulski added the comment:

Negative, this bug causes TravisCI to fail on every commit regardless of
code. Please treat this tickes as highest priority.

sob., 10 cze 2017 o 20:54 użytkownik Ned Deily 
napisał:

>
> Ned Deily added the comment:
>
> Can we close this issue then?
>
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[issue30623] python-nightly import numpy fails since recently

[Ned Deily]

Ned Deily added the comment:

Can we close this issue then?

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[issue30623] python-nightly import numpy fails since recently

[Nathaniel Smith]

Nathaniel Smith added the comment:

It's because Julian thinks _PyTraceMalloc_Untrack is going to lose its 
underscore in 3.7, so he made numpy assume that. Numpy issue, I'll see what we 
can do.

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[issue30623] python-nightly import numpy fails since recently

[Jelle Zijlstra]

Jelle Zijlstra added the comment:

The error is 
/home/travis/virtualenv/python3.7-dev/lib/python3.7/site-packages/numpy/core/multiarray.cpython-37m-x86_64-linux-gnu.so:
 undefined symbol: PyTraceMalloc_Untrack. On a quick look I couldn't find any 
recent changes in CPython related to tracemalloc.

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[issue30623] python-nightly import numpy fails since recently

[Antoine Pitrou]

Changes by Antoine Pitrou :


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nosy: +njs

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[issue30623] python-nightly import numpy fails since recently

[Arek Bulski]

New submission from Arek Bulski:

About few days ago python-nightly started failing on TravisCI for no reason, 
and I dont think its due to my code. In fact it fails on importing numpy but 
fails to get into catch ImportError. This is a recent BUG. 

Build log:
https://travis-ci.org/construct/construct/jobs/241153020

--
messages: 295644
nosy: Arek Bulski
priority: normal
severity: normal
status: open
title: python-nightly import numpy fails since recently
type: crash
versions: Python 3.7

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