concatenate 方法的一种替代方法是制作一个收件人数组，并将值复制到其中:

An alternative to concatenate approach is to make a recipient array, and copy values to it:

In [483]: a = np.arange(300).reshape(100,3)
In [484]: b=np.array([8,9])
In [485]: res = np.zeros((100,5),int)
In [486]: res[:,:3]=a
In [487]: res[:,3:]=b

采样时间

sample timings

In [488]: %%timeit
     ...: res = np.zeros((100,5),int)
     ...: res[:,:3]=a
     ...: res[:,3:]=b
     ...: 
     ...: 
6.11 µs ± 20.2 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

In [491]: timeit np.concatenate((a, b.repeat(100).reshape(2,-1).T),1)
7.74 µs ± 15.1 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

In [164]: timeit np.concatenate([a, np.ones([a.shape[0],1], dtype=int).dot(np.array([b]))], axis=1) 
8.58 µs ± 160 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)