Cross product of two vectors in Python

Question

How can I calculate the cross product of two vectors without the use of programming libraries?

E.g given vectors a = (1, 2, 3) and b = (4, 5, 6)

Answer 1

import numpy as np
a = np.array([1,0,0])  
b = np.array([0,1,0])  
#print the result    
print(np.cross(a,b))