np_array.sizea = np.arange(3)
b = np.arange(12).reshape((3, 4))
c = np.arange(24).reshape((2, 3, 4))
# it returns the total number of elements
print(a.size) # 3
print(b.size) # 12
print(c.size) # 24a = np.arange(3)
b = np.arange(12).reshape((3, 4))
c = np.arange(24).reshape((2, 3, 4))
# it returns the size of the first dimension (=np.shape[0])
print(len(a)) # 3
print(len(b)) # 3
print(len(c)) # 2