On Tue, Oct 19, 2021 at 9:43 AM <hongyi.z...@gmail.com> wrote:
>
> See the following testing in IPython shell:
>
> In [6]: import numpy as np
>
> In [7]: a = np.array([1], dtype=(bool))
>
> In [8]: b = np.array([1], dtype=bool)
>
> In [9]: a
> Out[9]: array([ True])
>
> In [10]: b
> Out[10]: array([ True])
>
> It seems that dtype=(bool) and dtype=bool are both correct usages. If so, 
> which is preferable?

For a one-element tuple, add a comma:

>>> bool
<class 'bool'>
>>> (bool)
<class 'bool'>
>>> (bool,)
(<class 'bool'>,)
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