[Numpy-discussion] np.equal
Fernando Perez
fperez.net@gmail....
Mon Dec 7 01:01:48 CST 2009
2009/12/6 josef.pktd <josef.pktd@gmail.com>:
>>>> np.equal(np.arange(5),'a')
> NotImplemented
Why is NotImplemented a *return* value? Normally NotImplementedError
is a raised exception, but if it's not implemented, it shouldn't be
returned as a value.
For one thing, it leads to absurdities like the following being possible:
In [6]: if np.equal(np.random.rand(5),'a'):
...: print("Array equal to 'a'")
...:
...:
Array equal to 'a'
In [7]: if np.equal(np.random.rand(5),'a'):
print("Array equal to 'a'")
...:
...:
Array equal to 'a'
In practice, it's as if np.equal() for not implemented cases returns
True always (since bool(NotImplemented)==True).
Cheers,
f
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