Message 243301 - Python tracker

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In-reply-to
Author	ncoghlan
Recipients	Carl.Friedrich.Bolz, Trundle, alex, benjamin.peterson, daniel.urban, eric.araujo, eric.snow, gregory.p.smith, meador.inge, ncoghlan, rhettinger, terry.reedy
Date	2015年05月16日.09:04:14
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1431767055.03.0.739353633886.issue11477@psf.upfronthosting.co.za>

Content
Nathaniel Smith pointed out on python-dev (https://mail.python.org/pipermail/python-dev/2015-May/140006.html) that NumPy is relying on this bug to implement elementwise multiplication of a list by a scalar array: In [9]: [1, 2] * np.array(2) Out[9]: array([2, 4]) He also pointed out that PyPy implemented bug-for-bug compatibility with this some time back: https://bitbucket.org/pypy/pypy/src/a1a494787f4112e42f50c6583e0fea18db3fb4fa/pypy/objspace/descroperation.py?at=default#cl-692

Content

Nathaniel Smith pointed out on python-dev (https://mail.python.org/pipermail/python-dev/2015-May/140006.html) that NumPy is relying on this bug to implement elementwise multiplication of a list by a scalar array:
 In [9]: [1, 2] * np.array(2)
 Out[9]: array([2, 4])
He also pointed out that PyPy implemented bug-for-bug compatibility with this some time back: https://bitbucket.org/pypy/pypy/src/a1a494787f4112e42f50c6583e0fea18db3fb4fa/pypy/objspace/descroperation.py?at=default#cl-692

History
Date	User	Action	Args
2015年05月16日 09:04:15	ncoghlan	set	recipients: + ncoghlan, rhettinger, terry.reedy, gregory.p.smith, Carl.Friedrich.Bolz, benjamin.peterson, eric.araujo, alex, Trundle, meador.inge, daniel.urban, eric.snow
2015年05月16日 09:04:15	ncoghlan	set	messageid: <1431767055.03.0.739353633886.issue11477@psf.upfronthosting.co.za>
2015年05月16日 09:04:15	ncoghlan	link	issue11477 messages
2015年05月16日 09:04:14	ncoghlan	create

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