numpy: 新建二维序列数组

法一

import numpy as np

a = np.arange(start=0, stop=9, step=1, dtype=int)
a.resize(3, 3)
print a
print type(a)

[[0 1 2]
 [3 4 5]
 [6 7 8]]
<type 'numpy.ndarray'>

Process finished with exit code 0

要特别注意这里的 .resize 没有返回值：

print a.resize(3, 3)

None

Process finished with exit code 0

法二

import numpy as np

a = np.arange(start=0, stop=9, step=1, dtype=int).reshape(3, 3)
print a
print type(a)

[[0 1 2]
 [3 4 5]
 [6 7 8]]
<type 'numpy.ndarray'>

Process finished with exit code 0

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