It might have to do with Python 3 removing the classic int type and moving all int operations to longs. If you compare Python2's Objects/intobject.c's i_divmod() function to Python3's ...
Multiplication on a common microcontroller is easy. But division is much more difficult. Even with hardware assistance, a 32-bit division on a modern 64-bit x86 CPU can run between 9 and 15 cycles.
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