8000 BUG: raise error for erroneous structured array assignment by mbyt · Pull Request #4556 · numpy/numpy · GitHub
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BUG: raise error for erroneous structured array assignment #4556

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mbyt
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@mbyt mbyt commented Mar 26, 2014

This pull request shows one possible way how to resolve #3126 and #3561: It just raises an error for non supported / erroneous operations.

import numpy as np
print np.__version__

x = np.empty(1, dtype=[('field', 'i4', 10)])
ones = np.ones(10, dtype='i4')

# OK
x[:]['field'] = 1 * ones     # array_assign_subscript
print x
x['field'] = 2 * ones        # array_assign_subscript
print x
x[0]['field'][:] = 3 * ones  # array_assign_slice
print x

# FAIL (only first item is assigned)
x[0]['field'] = 4 * ones     # voidtype_ass_subscript 
print x

However, it might be much nicer to actually assign the call correctly (I did not manage to do this, therefore I just raise an error). The above code lines show 4 operations how to assign the same field with their C function call as comment. Note that only the call to voidtype_ass_subscript fails.

python -c "import numpy; numpy.test()" run OK.

@mbyt mbyt changed the title BUG: Raise error for non supported structured array assignment BUG: raise error for erroneous structured array assignment Mar 26, 2014
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charris commented Mar 27, 2014

There seems to be a Python 3 related bug somewhere, and Python 2.6 is failing also. But 2.7 works :)

The commit messages should begin with one of the prefixes in doc/source/dev/gitwash/development_workflow.rst

@mbyt
BUG: non supported structured array assignments
fad3128 
Raising an error for non supported operations. Also adapting related
statement in test. Resolves numpy#3126 and numpy#3561.
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mbyt commented Mar 30, 2014

OK, good point. I resolved the 3.3 and 2.6 problems. In order to get the commit messages right, I squashed the commits in a rebase and forced a push.

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charris commented Mar 30, 2014

You did the right thing, the tests are running now. Sometimes it takes a while and sometimes travis is just not behaving.

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charris commented Mar 30, 2014

I left a note at #3126.

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mbyt commented Apr 30, 2014

I also left a note in #3126, how can we proceed?

@mbyt mbyt mentioned this pull request Dec 29, 2014
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mbyt commented Dec 29, 2014

I left a note in #3126 --- is there something that can be done to get this moving along?

@mbyt mbyt mentioned this pull request Feb 2, 2015
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mbyt commented Feb 3, 2015

I left a not in #3126.

@ahaldane ahaldane mentioned this pull request Feb 9, 2015
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@jmlarson1 jmlarson1 mentioned this pull request Feb 11, 2015
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@ahaldane ahaldane mentioned this pull request Mar 6, 2015
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@charris charris added this to the 1.10.0 release milestone May 8, 2015
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charris commented Jun 4, 2015

Looks like we are going to have a better fix for this issue, but it isn't in yet.

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charris commented Jun 10, 2015

Thanks @mbyt for the PR. I'm going to go with #5947 for this problem, so closing.

@charris charris closed this Jun 10, 2015
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Inconsistent array assignment for structured arrays
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