I'm working with sets and notice when I do:

```
s1 = set( ['a', 'b', 'c'])
s2 = set([1,2,3])
print s1.symmetric_difference(s2)
```

It prints it off as:

`set(['a', 1, 2, 3, 'c', 'b'])`

Is there any reason to why it displays it in the order of 'a', 1, 2, 3, 'c', 'b' and not simply 'a', 'b', 'c', 1, 2, 3? Or because sets are unordered it doesn't matter how it's printed and both would be the same?

Thanks!