Is there a way to add vertical line in a matrix using pylatex command?

Question

This is the code I currently have

import numpy as np
from pylatex import Document, Section, Subsection,Command, Matrix,VectorName,Math
from pylatex.utils import NoEscape,bold
def randomizer(n = 3,a = 0 ,b = 20):
    a = np.random.randint(a,b,size=(n, n+1))
    # return augmented matrix
    return n,a

def latexMiddle(doc):
    n,a = mc.randomizer()
    vec = Matrix(a, mtype='b')
    vec_name = VectorName('a')
    doc.append(NoEscape(r'\left['))
    math = Math(data=[vec_name, '=', vec])
    doc.append(math)
    doc.append(NoEscape(r'\right]'))
    doc.generate_tex()
    doc.generate_pdf(clean=True, clean_tex=False,compiler='pdflatex')

I want it to output a matrix as latex code. I expect the output to look like this:

    %
    \[%
    \mathbf{a} = 
    \left[
    \begin{array}{ccc|c}%
    0&6&7&6\\%
    12&19&1&12\\%
    9&5&3&17%
    \end{array}%
    \right]
    \]%   
    %

But it does not work the full code is in this link : https://pastebin.com/76JEPN9A