numpy array add row code example

Example 1: append row to array python

import numpy as np
newrow = [1,2,3]
A = np.vstack([A, newrow])

Example 2: how append row in numpy

import numpy as np    
arr = np.empty((0,3), int)
print("Empty array:")
print(arr)
arr = np.append(arr, np.array([[10,20,30]]), axis=0)
arr = np.append(arr, np.array([[40,50,60]]), axis=0)
print("After adding two new arrays:")
print(arr)

Example 3: np append row

A= [[1, 2, 3], [4, 5, 6]]
np.append(A, [[7, 8, 9]], axis=0)

    >> array([[1, 2, 3],
              [4, 5, 6],
              [7, 8, 9]])
#or 
np.r_[A,[[7,8,9]]]

Example 4: python append row to 2d array

new_row.append([])