On Thu, 27 Nov 2008 12:12:38 +0000, adam carr wrote:
> I'm still in the position of having to right code to deal with
> converting None to an empty list and one object to a list with a single
> entry.
> Python casting doesn't work here.
Python doesn't have type-casting. Python has type conversions:
mytype(obj)
doesn't force the type of obj to be "mytype", but constructs a new mytype
object from obj.
> Maybe it's just wishful thinking, but I would have thought there would
> be a cleaner way of doing this.
What's wrong with something as simple as this?
def get_items():
x = None
# lots of work here...
if isinstance(x, list): # is x list-like?
return x
else:
return [] if x is None else return [x]
Depending on your function, you may need to change the list test.
isinstance(x, list) # x is a list, or a sub-class of list
type(x) is list # x is a list, but not a sub-class
hasattr(x, '__iter__') # x looks more or less list-like
--
Steven
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