import numpy
from numpy.linalg import norm

v = numpy.array([1, 2, -3])
max_norm = norm(v, ord=numpy.inf)

print("Vector v: \n", v)
print("The max norm of the vector v: ", max_norm)

Here, v is a vector. We are using the norm() function from numpy.linalg to calculate the max norm of the vector. The argument “ord=numpy.inf” indicates that we want to calculate the max norm of the vector.

The output of the above program will be:

Vector v: 
 [ 1  2 -3]
The max norm of the vector v:  3.0