Newbie: tuple list confusion.

[George Yoshida]

Q852913745 wrote:

> My book states that a=a+b and a+=b are the same, and that different 'types' of
> sequence cannot be joined together.

This is because list's += is implemented to work like list's extend 
method. Change "a += b" with "a.extend(b)". You get the same result. It 
might be counterintuitive, but it is the way '+=' is implemented.

I'll add two pointers. Check them.

* Concatenating a tuple to a list
   http://www.python.org/sf/575536
* list += string??
   http://mail.python.org/pipermail/python-dev/2004-August/048389.html

- george