#itemsize shows the length of one array element in bytes
import numpy as np
a = np.array([[1,2,3],[4,5,6]],dtype = np.int64)
a.itemsize
#output will be 8
myArray.shape # Returns the number of rows, columns etc. (depends on dimensions how many numbers you get)
print(a_1d.shape)
# (3,)
print(type(a_1d.shape))
# <class 'tuple'>
print(a_2d.shape)
# (3, 4)
print(a_3d.shape)
# (2, 3, 4)