[Numpy-discussion] type checking, what's recommended?

[Olivier Delalleau]

We have indeed been using "type(a) is np.ndarray" in Theano to check that.
If there's a better way, I'm interested to know as well :)

-=- Olivier

2011/12/7 <josef.pktd at gmail.com>

> If I want to know whether something that might be an array is really a
> plain ndarray and not a subclass, is using `type` the safest bet?
>
> All the other forms don't discriminate against subclasses.
>
> >>> type(np.ma.zeros(3)) is np.ndarray
> False
> >>> type(np.zeros(3)) is np.ndarray
> True
>
> >>> isinstance(np.ma.zeros(3), np.ndarray)
> True
> >>> isinstance(np.zeros(3), np.ndarray)
> True
>
> >>> issubclass(np.ma.zeros(3).__class__, np.ndarray)
> True
> >>> issubclass(np.zeros(3).__class__, np.ndarray)
> True
>
> >>> isinstance(np.matrix(np.zeros(3)), np.ndarray)
> True
> >>> type(np.matrix(np.zeros(3))) is np.ndarray
> False
>
> Thanks,
>
> Josef
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