python, numpy; How to insert element at the start of an array

Question

I have an numpy array of complex numbers. So I want to insert zero at start of the array, and shift the rest of the array one place forward.

example:

Answer 1

Additionally, if you want to add n numbers of rows with zero values. you can create a zero array and use hstack:

zero_array = np.zeros([n])
new = np.hstack([zero_array,old_array])