isinstance(.., file) for Python 3

Duncan Booth duncan.booth at invalid.invalid
Thu Nov 8 14:58:11 CET 2012

Ulrich Eckhardt <ulrich.eckhardt at> wrote:

> If possible, I'm looking for a solution that works for Pythons 2 and 3, 
> since I'm not fully through the conversion yet and have clients that 
> might use the older snake for some time before shedding their skin.
> Suggestions?

Why bother checking types at all?

def foo(file_or_string):
        data =
    except AttributeError:
        data = file_or_string
    ... use data ...

Duncan Booth

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