Terry Carroll wrote:
> I ended up writing a short isListOrTuple function that went something
> like this:
>
> def isListOrTuple(thing):
> result = False
> if isinstance(thing, list): result = True
> if isinstance(thing, tuple): result = True
> return result
isinstance can take a tuple of types as its second argument so this
could be written
def isListOrTuple(thing):
return isinstance(thing, (list, tuple))
> How much cleanar it would have been to just write:
>
> if type(param) in [list, tuple]:
> stuff
> else:
> other stuff
Note that
isinstance(thing, (list, tuple))
and
type(thing) in [list, tuple]
are not equivalent. The first will be true for objects whose type is a
subclass of list and tuple while the second will not.
In [2]: class Foo(list): pass
...:
In [3]: f=Foo()
In [4]: type(f)
Out[4]: <class '__main__.Foo'>
In [5]: type(f) in [list, tuple]
Out[5]: False
In [6]: isinstance(f, list)
Out[6]: True
Kent
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