[EMAIL PROTECTED] wrote:
>
> Marc 'BlackJack' Rintsch a ecrit :
>
>> And what do you do if you check for `file` and it isn't such an instance?
>> Raise an exception? A no, that's something you don't like. So what
>> else? ;-)
>
> Well, I prefer the idea of raising my *own* exception to the idea of
> having an unknown behavior occur (for ex : what if the argument is NOT
> a File, but is "itereable" ?)
>
> But anyway, I guess the most "pythonic" way is to do nothing ;-)
Indeed, don't waste time to make your code less general. Why would you want
to prevent your show_lines() function from processing a list of strings or
a StringIO?
> One more question : how to test if 'file' is a File object ?
The file type is actually spelt lowercase, so 'file' is not a good idea as a
variable name.
>>> f = file("tmp.txt")
>>> isinstance(f, file) # isinstance(f, open) looks odd
True
isinstance() returns True for subclasses, if you don't want that either:
>>> type(f) is file
True
Peter
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