Dunno, seems unlikely that something changed with Python 3.4.2... $ python --version Python 3.4.2 $ python -c 'import numpy as np; print(np.__version__); t = np.array(None); t[()] = np.array([None, None]); t.__bool__(); t.__nonzero__()' 1.9.0 Traceback (most recent call last): File "<string>", line 1, in <module> AttributeError: 'numpy.ndarray' object has no attribute '__nonzero__'
2014-11-13 10:05 GMT-08:00 Alan G Isaac <alan.is...@gmail.com>: > On 11/13/2014 12:37 PM, Antony Lee wrote: > > On Python3, __nonzero__ is never defined (always raises an > AttributeError), even after calling __bool__. > > > The example I posted was Python 3.4.1 with numpy 1.9.0. > > fwiw, > Alan Isaac > > Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:38:22) [MSC v.1600 32 > bit (Intel)] on win32 > Type "help", "copyright", "credits" or "license" for more information. > >>> import numpy as np > >>> np.__version__ > '1.9.0' > >>> t = np.array(None); t[()] = np.array([None, None]) > >>> t.__nonzero__() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > AttributeError: 'numpy.ndarray' object has no attribute '__nonzero__' > >>> t.__bool__() > True > >>> t.__nonzero__() > ValueError: The truth value of an array with more than one element is > ambiguous. Use a.any() or a.all() > >>> > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion >
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