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Re:CircuitPython: Programming Hardware in Python by ducktective on Wednesday January 27, 2021 @12:53AM (#25924787)
Depends on the level of abstraction you and your kid are willing to get into.

Arduino's are lower-level C/C++ which may be a little more complex than CP, but have much broader library support (better intro to EE/embedded).

RPis are much higher level which could be programmed in any language (better intro to CS/Linux).

Re:CircuitPython: Programming Hardware in Python by M5x7wI3CmbEem10 on Wednesday January 27, 2021 @11:52AM (#25930466)
for kids, so ideally not as low as C++