New submission from Stefan Krah <stefan-use...@bytereef.org>:

Numpy and PyBuffer_IsContiguous() have different ideas of
C-contiguity if there is a zero in strides (this is allowed,
I asked Pauli Virtanen).


>>> from numpy import *
>>> nd = ndarray(shape=[10], strides=[0])
>>> nd.flags
  C_CONTIGUOUS : True
  F_CONTIGUOUS : False
  OWNDATA : True
  WRITEABLE : True
  ALIGNED : True
  UPDATEIFCOPY : False
>>> 
>>> from _testbuffer import ndarray as pyarray
>>> from _testbuffer import PyBUF_FULL_RO
>>> x = pyarray(nd, getbuf=PyBUF_FULL_RO)
>>> x.c_contiguous
False

----------
assignee: skrah
components: Interpreter Core
messages: 143005
nosy: skrah
priority: normal
severity: normal
status: open
title: PEP-3118: C-contiguity with zero strides
type: behavior
versions: Python 3.3

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12845>
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