Pablo Galindo Salgado <[email protected]> added the comment:
If you want to add a test, you could check the dis output for this example:
def make_func(x):
def f(x : not (x is x), /): ...
In this case the compiler emits:
3 0 LOAD_GLOBAL 0 (x)
2 LOAD_GLOBAL 0 (x)
4 COMPARE_OP 8 (is)
6 UNARY_NOT
8 LOAD_CONST 1 (('x',))
10 BUILD_CONST_KEY_MAP 1
12 LOAD_CONST 2 (<code object f at 0x7f3754f71040,
file "/home/pablogsal/github/python/master/lel.py", line 3>)
14 LOAD_CONST 3 ('code.<locals>.f')
16 MAKE_FUNCTION 4 (annotations)
18 STORE_FAST 0 (f)
while for
def make_func(x):
def f(x : not (x is x)): .
emits more efficient code (using 'not is' instead of is and UNARY_NOT:
4 20 LOAD_GLOBAL 0 (x)
22 LOAD_GLOBAL 0 (x)
24 COMPARE_OP 9 (is not)
26 LOAD_CONST 1 (('x',))
28 BUILD_CONST_KEY_MAP 1
30 LOAD_CONST 4 (<code object g at 0x7f3754f135f0,
file "/home/pablogsal/github/python/master/lel.py", line 4>)
32 LOAD_CONST 5 ('code.<locals>.g')
34 MAKE_FUNCTION 4 (annotations)
36 STORE_FAST 1 (g)
38 LOAD_CONST 0 (None)
40 RETURN_VALUE
Adding the missing line makes them do the same.
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<https://bugs.python.org/issue39216>
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