A Blender script that converts all shape keys in a Curve object to a mesh with shape keys

curve-shapekey-to-mesh.py

'''
A Blender script that 
1. Convert all shape keys in a curve object to mesh
2. Join all shape keys to a new mesh object
'''

import bpy

def resetAllShapeKeys(target):
    for key in target.data.shape_keys.key_blocks:
        key.value = 0

def convertToMeshWithShapeKeys(sourceObj):
    #  Assertions
    assert(sourceObj is not None)
    assert(sourceObj.type == 'CURVE')
    assert(sourceObj.data.shape_keys is not None)
    
    # Convert all shape keys to mesh
    baseObject = None

    for key in sourceObj.data.shape_keys.key_blocks:
        print(f"Converting {key.name}")

        # Set this shape key to 1
        resetAllShapeKeys(sourceObj)
        key.value = 1

        # Note: Need to select the object before converting
        bpy.ops.object.select_all(action='DESELECT')
        sourceObj.select_set(True)
        bpy.context.view_layer.objects.active = sourceObj
        bpy.ops.object.convert(target='MESH', keep_original=True, merge_customdata=True)
        
        # Get the converted mesh
        newMesh = bpy.context.active_object
        newMesh.select_set(False)
        newMesh.name = key.name

        if baseObject is None:
            baseObject = newMesh
        else:
            # Join the mesh to the base mesh
            bpy.ops.object.select_all(action='DESELECT')
            bpy.context.view_layer.objects.active = baseObject
            baseObject.select_set(True)

            newMesh.select_set(True)
            bpy.ops.object.join_shapes()
            bpy.data.objects.remove(newMesh)
    
    baseObject.name = f"{sourceObj.name}_mesh"
    resetAllShapeKeys(sourceObj)

    sourceObj.select_set(True)
    bpy.context.view_layer.objects.active = sourceObj

convertToMeshWithShapeKeys(bpy.context.active_object)