Here is another robot arm kit that can introduce your kids to coding and help them graduate to Python. The SunFounder PiArm has 3 parts (shovel bucket, hanging clips, and electromagnet). It can be controlled with a joystick or through Ezblock.
This robot can be programmed via drag & drop. It works with Raspberry Pi 4B, 3B+, and 3B. It can be used to pick up and move small items and tools.