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The dis for this function:
def f1(cm): with cm: x = 1 x = 2is this:
11 0 RESUME 0 12 2 LOAD_FAST 0 (cm) 4 BEFORE_WITH 6 POP_TOP 13 8 LOAD_CONST 1 (1) 10 STORE_FAST 1 (x) 12 12 LOAD_CONST 0 (None) 14 LOAD_CONST 0 (None) 16 LOAD_CONST 0 (None) 18 CALL 2 28 POP_TOP 14 30 LOAD_CONST 2 (2) 32 STORE_FAST 1 (x) 34 LOAD_CONST 0 (None) 36 RETURN_VALUE 12 >> 38 PUSH_EXC_INFO 40 WITH_EXCEPT_START 42 POP_JUMP_FORWARD_IF_TRUE 4 (to 52) 44 RERAISE 2 >> 46 COPY 3 48 POP_EXCEPT 50 RERAISE 1 >> 52 POP_TOP 54 POP_EXCEPT 56 POP_TOP 58 POP_TOP 14 60 LOAD_CONST 2 (2) 62 STORE_FAST 1 (x) 64 LOAD_CONST 0 (None) 66 RETURN_VALUEExceptionTable: 6 to 10 -> 38 [1] lasti 38 to 44 -> 46 [3] lasti 52 to 52 -> 46 [3] lastiNote the last row of the exception table: inst 52 goes to 46, same as 38-44. We can reorder the code so that this block is consecutive, and we save one entry in the exception table for each with/async with:
11 0 RESUME 0 12 2 LOAD_FAST 0 (cm) 4 BEFORE_WITH 6 POP_TOP 13 8 LOAD_CONST 1 (1) 10 STORE_FAST 1 (x) 12 12 LOAD_CONST 0 (None) 14 LOAD_CONST 0 (None) 16 LOAD_CONST 0 (None) 18 CALL 2 28 POP_TOP 14 30 LOAD_CONST 2 (2) 32 STORE_FAST 1 (x) 34 LOAD_CONST 0 (None) 36 RETURN_VALUE 12 >> 38 PUSH_EXC_INFO 40 WITH_EXCEPT_START 42 POP_JUMP_FORWARD_IF_TRUE 1 (to 46) 44 RERAISE 2 >> 46 POP_TOP 48 POP_EXCEPT 50 POP_TOP 52 POP_TOP 14 54 LOAD_CONST 2 (2) 56 STORE_FAST 1 (x) 58 LOAD_CONST 0 (None) 60 RETURN_VALUE >> 62 COPY 3 64 POP_EXCEPT 66 RERAISE 1ExceptionTable: 6 to 10 -> 38 [1] lasti 38 to 46 -> 62 [3] lasti