[Python-ideas] Tighten up the formal grammar and parsing a bit?

[Pavol Lisy]

Something broken like this?

import inspect
def cond():
    if 'not cond' in inspect.stack()[1].code_context[0]:
        return False
    return True

if cond():
    print('yes')
else:
    print('no')

if not cond():
    print('no')
else:
    print('yes')

On 5/15/17, Ryan Gonzalez <rymg19 at gmail.com> wrote:
> I guess maybe if you overload the operators to return broken objects, maybe
> then they would be different?
>
> --
> Ryan (ライアン)
> Yoko Shimomura > ryo (supercell/EGOIST) > Hiroyuki Sawano >> everyone else
> http://refi64.com
>
> On May 15, 2017 9:50 AM, "Serhiy Storchaka" <storchaka at gmail.com> wrote:
>
>> On 15.05.17 16:00, Steven D'Aprano wrote:
>>
>>> There's also cases where
>>>
>>>     if x > y:
>>>         pass
>>>     else:
>>>         code
>>>
>>> is *not necessarily* the same as
>>>
>>>     if not (x > y):
>>>         code
>>>
>>
>> This is not true.
>>
>>     if not cond:
>>         stmt1
>>     else:
>>         stmt2
>>
>> always is equivalent to
>>
>>     if cond:
>>         stmt2
>>     else:
>>         stmt1
>>
>>
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>