[Tutor] nul file in Windows

[Timo]

Dave Angel schreef:
> Timo List wrote:
>> For my program I disable the py2exe log feature by routing output to the
>> nul-file.
>> Code:
>>
>>         if win32 and py2exe:
>>             sys.stdout = open("nul", "w")
>>             sys.stderr = open("nul", "w")
>>
>> This always worked fine.
>>
>> Today, I received an email from a user with the following error:
>> IOError: [Errno 2] No such file or directory: 'nul'
>>
>> Now, I thought the nul-file always existed, shouldn't it?
>> Is there another way to disable output, if this one fails?
>>
>> Cheers,
>> Timo
>>
>>   
> All you need is an object that behaves like a file, but does nothing 
> with the data sent to it.  That's what duck-typing is all about.
>
> I haven't tried it, but I'd start by making a new class:
>
> class  NullFile(object):
>    def __init__(self, *arg, **kwarg):
>             pass
>    def write(self, data, *arg, **kwarg):
>            pass
>     def close(self, *arg, **kwarg):
>           pass
>
> and just say
>    sys.stdout = NullFile()
Thanks, this is what I was looking for.

>
> If you get any exceptions, you could add new methods to this file, 
> accordingly.
I already catch exceptions with my own function:
    sys.excepthook = self.exception_hook

Disabling stdout and stderr is to prevent py2exe from generating it's 
own logreport on exceptions.

Cheers,
Timo

>
>
> DaveA
>