Yeah, just checked it:

```python

Python 2.5.6 (r256:88840, Aug 21 2013, 17:00:00) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo(a, b, c): pass

>>> foo(*(1,2), b='foo', **{'c': ''})
  File "<stdin>", line 1
    foo(*(1,2), b='foo', **{'c': ''})
                ^
SyntaxError: invalid syntax
```

Solution would be to only use arg and kwarg expansion. So doing something like:

```python
kwargs = kwargs.copy()
kwargs['datacenter'] = DATACENTER
...
```