如何在Python中将多个numpy文件附加到一个numpy文件中

如何在Python中将多个numpy文件附加到一个numpy文件中

正如在

在附加模式下加载使用numpy.save保存的数组

可以多次保存到打开的文件，也可以多次加载。这没有记录，可能不是首选，但是可以。

savez

存档是保存多个阵列的首选方法。

这是一个玩具示例：

In [777]: with open('multisave.npy','wb') as f:     ...:     arr = np.arange(10)     ...:     np.save(f, arr)     ...:     arr = np.arange(20)     ...:     np.save(f, arr)     ...:     arr = np.ones((3,4))     ...:     np.save(f, arr)     ...:     In [778]: ll multisave.npy-rw-rw-r-- 1 paul 456 Feb 13 08:38 multisave.npyIn [779]: with open('multisave.npy','rb') as f:     ...:     arr = np.load(f)     ...:     print(arr)     ...:     print(np.load(f))     ...:     print(np.load(f))     ...:     [0 1 2 3 4 5 6 7 8 9][ 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19][[ 1.  1.  1.  1.] [ 1.  1.  1.  1.] [ 1.  1.  1.  1.]]

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这是保存相同形状的数组列表的简单示例

In [780]: traces = [np.arange(10),np.arange(10,20),np.arange(100,110)]In [781]: tracesOut[781]: [array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]), array([10, 11, 12, 13, 14, 15, 16, 17, 18, 19]), array([100, 101, 102, 103, 104, 105, 106, 107, 108, 109])]In [782]: arr = np.array(traces)In [783]: arrOut[783]: array([[  0,   1,   2,   3,   4,   5,   6,   7,   8,   9],       [ 10,  11,  12,  13,  14,  15,  16,  17,  18,  19],       [100, 101, 102, 103, 104, 105, 106, 107, 108, 109]])In [785]: np.save('mult1.npy', arr)In [786]: data = np.load('mult1.npy')In [787]: dataOut[787]: array([[  0,   1,   2,   3,   4,   5,   6,   7,   8,   9],       [ 10,  11,  12,  13,  14,  15,  16,  17,  18,  19],       [100, 101, 102, 103, 104, 105, 106, 107, 108, 109]])In [788]: list(data)Out[788]: [array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]), array([10, 11, 12, 13, 14, 15, 16, 17, 18, 19]), array([100, 101, 102, 103, 104, 105, 106, 107, 108, 109])]