What are the parameters for 'createSoftBodyAnchor'?

[aprath1]

Hi I am working on understanding soft bodies in pybullet. I saw a functionality to create soft body anchor in the example file - https://github.com/bulletphysics/bullet3/blob/master/examples/pybullet/examples/deformable_anchor.py

But there was no documentation about the parameters of createSoftBodyAnchor in the PyBullet Quickstart Guide.
->For example below is line 23 in deformable_anchor.py:
p.createSoftBodyAnchor(clothId ,24,-1,-1)
What does 24, -1 and -1 stand for ?
->below is line 25 in d
p.createSoftBodyAnchor(clothId ,15,boxId,-1, [0.5,-0.5,0])
Here what does 15, [0.5, -0.5, 0] indicate?
Is there a repo where all the functions mentioned in the pybullet quick start guide is defined ?

[aprath1]

Guess the line 686 in Bullet C API gives an insight to this.
But it would be great if any one can share where are all the python wrappers or binding functions in the pybullet quick start guide is defined...?