MicroPython's authors call it a "subset of python3", and that is a fairly large subset - all the familiar data structures, co-routines, module import, filesystem I/O, FFI, ...; Interpreter is much smaller than CPython and can run on a microcontroller with 256KB code/flash + 16KB RAM.

Another step down is snek, where complete interpreter code can fit in 64KB. Although, this is a much more constrained subset of python (for example - yes dictionaries, no list comprehensions): https://sneklang.org/

PikaScript appear to be even more compact at 32KB code (and is even smaller subset of the language)