List assignment, unexpected result

[Paul Rubin]

"Steve Coates" <steve.coates at virgin.net> writes:
> Thanks for the help. I think my favourite solution was
> 
> grid = [['.' * 4] for i in range(4)]
> 
> but I'll need to read up on the syntax. I haven't seen this
> use of a for loop before.

That's not a for loop, it's a new Python gizmo called a list
comprehension.  List comprehensions were introduced in Python 2.0.
You can find more info about list comprehensions in the Python docs.
But if your script has to work under earlier Python versions than 2.0,
don't use them.