[issue39864] IndexError gives wrong axis info
Peter Otten
report at bugs.python.org
Thu Mar 5 10:42:26 EST 2020
Peter Otten <__peter__ at web.de> added the comment:
This is not a bug (and if it were you would have to report to numpy, not cpython).
Consider:
>>> import numpy
>>> a = numpy.zeros((2,2,2))
>>> a[0,2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: index 2 is out of bounds for axis 1 with size 2
This is probably the message you expect. However, if you write
>>> a[0][2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: index 2 is out of bounds for axis 0 with size 2
you split the operation into two steps, and the second axis of a is effectively the first axis of a[0].
----------
nosy: +peter.otten -steven.daprano
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