New submission from Phil Connell:
The following two expressions should have the same value:
Python 3.4.0a0 (default:fae92309c3be, Jun 14 2013, 09:29:54)
[GCC 4.8.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 1 in [2] == False
False
>>> (1 in [2]) == False
True
It looks like this is a compiler issue - there shouldn't be a jump if the 'in'
expression is false:
>>> dis.dis("1 in [2] == False")
1 0 LOAD_CONST 0 (1)
3 LOAD_CONST 1 (2)
6 BUILD_LIST 1
9 DUP_TOP
10 ROT_THREE
11 COMPARE_OP 6 (in)
14 JUMP_IF_FALSE_OR_POP 24
17 LOAD_CONST 2 (False)
20 COMPARE_OP 2 (==)
23 RETURN_VALUE
>> 24 ROT_TWO
25 POP_TOP
26 RETURN_VALUE
>>>
----------
components: Interpreter Core
messages: 191108
nosy: benjamin.peterson, brett.cannon, georg.brandl, isoschiz, ncoghlan,
pconnell
priority: normal
severity: normal
status: open
title: Wrong bytecode generated for 'in' operation
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18208>
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