create a triangular mesh from vertex coordinates

You can try scipy.spatial.Delaunay. From that link:

points = np.array([[0, 0], [0, 1.1], [1, 0], [1, 1]])

from scipy.spatial import Delaunay

tri = Delaunay(points)

plt.triplot(points[:,0], points[:,1], tri.simplices)

plt.plot(points[:,0], points[:,1], 'o')

plt.show()

Output:

enter image description here

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