2.9 结构化数组

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import numpy as  np

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np.dtype([('name','S10'),('age','i4'),('weight','f8')])

dtype([('name', 'S10'), ('age', '<i4'), ('weight', '<f8')])

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np.dtype('S10,i4,f8')

dtype([('f0', 'S10'), ('f1', '<i4'), ('f2', '<f8')])

2.9.2 高级复合类型

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tp = np.dtype([('id','i8'),('mat','f8',(3,3))])
X = np.zeros(1, dtype=tp)
print(X[0])
print(X['mat'][0])

(0, [[0., 0., 0.], [0., 0., 0.], [0., 0., 0.]])
[[0. 0. 0.]
 [0. 0. 0.]
 [0. 0. 0.]]