Bake Shape to Blendshape

gistfile1.py

import maya.cmds as cmds

def bakeShapeToBlendShape(node, start, end):
    step = 1.0 / end
    
    bs_node = cmds.duplicate(node, n=node + '_blendshape')[0]
    cmds.currentTime(end)
    copy = cmds.duplicate(node)[0]
    
    bs = cmds.blendShape(bs_node)[0]
    cmds.blendShape(bs, edit=True, target=(bs_node, 1, copy, 1))
    
    cmds.delete(copy)

    for count in range(start, end):
        index = count * step
        cmds.currentTime(count)
        copy = cmds.duplicate(node)[0]
        cmds.blendShape(bs, edit=True,inBetween=True, target=(bs_node, 1, copy, index))
        
        cmds.delete(copy)

for node in cmds.ls(selection=True):
    cmds.currentTime(1)
    bakeShapeToBlendShape(node, 1, 100)