npumpy.insert(arr, obj, values[, axis])

https://docs.scipy.org/doc/numpy/reference/generated/numpy.insert.html#numpy.insert

In [1]: import numpy as np   ...: a=np.array([1,2,3,4,5])In [2]: np.insert(a,0,6) # 在插入的索引位置添加元素，其余元素后排Out[2]: array([6, 1, 2, 3, 4, 5])In [3]: np.insert(a,5,6) # 本来索引范围是0:4，所以要在最后一位插入需要最大的索引加1Out[3]: array([1, 2, 3, 4, 5, 6])In [4]: np.insert(a,6,6) # 6超过了最大索引加1，会报错Traceback (most recent call last):  File "<ipython-input-4-a4add68f3ad4>", line 1, in <module>    np.insert(a,6,6)  File "/home/claroja/Program/Anaconda3/lib/python3.6/site-packages/numpy/lib/function_base.py", line 4892, in insert    "size %i" % (obj, axis, N))IndexError: index 6 is out of bounds for axis 0 with size 5