placing python tuples in function signature

It's called tuple parameter unpacking and was removed in Python 3.0.

Like @zondo said, you might not want to use it for compatibility reasons. I myself still use it occasionally in Python 2. You'll find reasons against it in the PEP of my first link, though keep in mind that those are the reasons it got removed from the language, and I think it was at least partially because it made things easier for the Python makers, which is not necessarily a reason for you or me to avoid it.

In Python2, that's great. It is invalid syntax in Python3, however, so I would not recommend it for forward-compatability reasons.