// https://groups.google.com/g/python_inside_maya/c/S76JwjBmvP0/m/8SpoMqTuAAAJ

import maya.cmds as mc

def add_attribute_and_create_group(*args):
    attribute_name = mc.textField(attribute_field, query=True, text=True)
    selected_objects = mc.ls(selection=True)

    created_groups = []

    for selected_object in selected_objects:
        if not mc.objExists("{0}.{1}".format(selected_object, attribute_name)):
            mc.addAttr(selected_object, ln=attribute_name, at="double", min=0, max=1, dv=0, keyable=True)

        group_name = selected_object + "_spaceGrp"
        if not mc.objExists(group_name):
            new_group = mc.group(selected_object, name=group_name)
            mc.xform(new_group, centerPivots=True)
            created_groups.append(new_group)

    mc.select(selected_objects, replace=True)
    print('Returned object is:', created_groups)

def create_parent_constraint(*args):
    selected_objects = mc.ls(selection=True)
    if not selected_objects:
        print("Nessun oggetto selezionato.")
        return

    groups = mc.ls("*_spaceGrp")
    if not groups:
        print("Nessun gruppo creato.")
        return

    for selected_object in selected_objects:
        mc.parentConstraint(selected_object, groups[0], maintainOffset=True)
        print("ParentConstraint creato tra", selected_object, "e", groups[0])


# Creazione della finestra
try:
    mc.deleteUI(window)
except (NameError, RuntimeError):
    pass
window = mc.window(title="Add Attribute")
mc.columnLayout(adjustableColumn=True)
attribute_field = mc.textField(text="")
mc.button(label="Esegui", command=add_attribute_and_create_group)
mc.button(label="Parent", command=create_parent_constraint)
mc.showWindow(window)