python numpy访问行列元素的方法

import numpy as np
a = np.array([[2,1],[10,5]])
print(a)
print(a[:,1])#col 1
print(a[1])#row 1
print(a[1,1]) #a[1][1]
print(a[0:1,0:1]) row 0:1 col 0:1
# u, d, v = np.linalg.svd(a)

[[ 2 1]
[10 5]]
[1 5]
[10 5]
5
[[2]]
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