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hstackやvstackでできないことをdstackで

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a = np.array(['1', '2'])
b = np.array(['a', 'b'])

aとbを合わせて次のようにしたい

array([['1', 'a'],
       ['2', 'b']])

hstackやvstackでできなかったので下記のようにやった。

>>>np.dstack((a, b))
array([[['1', 'a'],
        ['2', 'b']]])
>>>np.dstack((a, b)).shape
(1, 2, 2)
>>>c.reshape(c.shape[1], c.shape[2])
array([['1', 'a'],
       ['2', 'b']], dtype='<U1')
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