def f(x): match x: case a,b: return 1 import dis from pprint import pprint as pp def pos(p): return (p.lineno, p.end_lineno, p.col_offset, p.end_col_offset) pp([(pos(x.positions), x.opname, x.argval) for x in dis.get_instructions(f)]) 

[((2, 2, 0, 0), 'RESUME', 0), ((3, 3, 8, 9), 'LOAD_FAST', 'x'), ((4, 4, 9, 12), 'MATCH_SEQUENCE', None), ((4, 4, 9, 12), 'POP_JUMP_IF_FALSE', 32), ((4, 4, 9, 12), 'GET_LEN', None), ((4, 4, 9, 12), 'LOAD_CONST', 2), ((4, 4, 9, 12), 'COMPARE_OP', '=='), ((4, 4, 9, 12), 'POP_JUMP_IF_FALSE', 32), ((4, 4, 9, 12), 'UNPACK_SEQUENCE', 2), ((4, 4, 11, 12), 'STORE_FAST', 'a'), <-- incorrect ((4, 4, 11, 12), 'STORE_FAST', 'b'), ((5, 5, 15, 16), 'LOAD_CONST', 1), ((5, 5, 15, 16), 'RETURN_VALUE', None), ((4, 4, 9, 12), 'POP_TOP', None), ((4, 4, 9, 12), 'LOAD_CONST', None), ((4, 4, 9, 12), 'RETURN_VALUE', None)]