Ned Batchelder <n...@nedbatchelder.com> added the comment:
To add to the confusion, the treatment of "if __debug__:" and "if not
__debug__:" is now asymmetric:
Here is debug.py:
import dis
import sys
print(sys.version)
def f():
if __debug__:
print("debug")
else:
print("not debug")
if not __debug__:
print("NOT DEBUG")
else:
print("DEBUG")
dis.dis(f)
$ python3.8 /tmp/debug.py
3.8.0b2 (default, Jul 4 2019, 22:38:04)
[Clang 10.0.0 (clang-1000.10.44.4)]
7 0 LOAD_GLOBAL 0 (print)
2 LOAD_CONST 1 ('debug')
4 CALL_FUNCTION 1
6 POP_TOP
10 8 LOAD_CONST 2 (False)
10 POP_JUMP_IF_FALSE 22
11 12 LOAD_GLOBAL 0 (print)
14 LOAD_CONST 3 ('NOT DEBUG')
16 CALL_FUNCTION 1
18 POP_TOP
20 JUMP_FORWARD 8 (to 30)
13 >> 22 LOAD_GLOBAL 0 (print)
24 LOAD_CONST 4 ('DEBUG')
26 CALL_FUNCTION 1
28 POP_TOP
>> 30 LOAD_CONST 0 (None)
32 RETURN_VALUE
$ python3.8 -O /tmp/debug.py
3.8.0b2 (default, Jul 4 2019, 22:38:04)
[Clang 10.0.0 (clang-1000.10.44.4)]
6 0 LOAD_CONST 1 (False)
2 POP_JUMP_IF_FALSE 14
7 4 LOAD_GLOBAL 0 (print)
6 LOAD_CONST 2 ('debug')
8 CALL_FUNCTION 1
10 POP_TOP
12 JUMP_FORWARD 8 (to 22)
9 >> 14 LOAD_GLOBAL 0 (print)
16 LOAD_CONST 3 ('not debug')
18 CALL_FUNCTION 1
20 POP_TOP
11 >> 22 LOAD_GLOBAL 0 (print)
24 LOAD_CONST 4 ('NOT DEBUG')
26 CALL_FUNCTION 1
28 POP_TOP
30 LOAD_CONST 0 (None)
32 RETURN_VALUE
In 3.7 (and earlier) the behavior was balanced:
$ python3.7 /tmp/debug.py
3.7.3 (default, Apr 10 2019, 10:27:53)
[Clang 10.0.0 (clang-1000.10.44.4)]
7 0 LOAD_GLOBAL 0 (print)
2 LOAD_CONST 1 ('debug')
4 CALL_FUNCTION 1
6 POP_TOP
13 8 LOAD_GLOBAL 0 (print)
10 LOAD_CONST 2 ('DEBUG')
12 CALL_FUNCTION 1
14 POP_TOP
16 LOAD_CONST 0 (None)
18 RETURN_VALUE
$ python3.7 -O /tmp/debug.py
3.7.3 (default, Apr 10 2019, 10:27:53)
[Clang 10.0.0 (clang-1000.10.44.4)]
9 0 LOAD_GLOBAL 0 (print)
2 LOAD_CONST 1 ('not debug')
4 CALL_FUNCTION 1
6 POP_TOP
11 8 LOAD_GLOBAL 0 (print)
10 LOAD_CONST 2 ('NOT DEBUG')
12 CALL_FUNCTION 1
14 POP_TOP
16 LOAD_CONST 0 (None)
18 RETURN_VALUE
Is this really the desired behavior?
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37500>
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