[Tutor] What's going on in this Python code from Programming Collective Intelligence?

[Alan Gauld]

On 10/07/13 13:05, Dave Angel wrote:

> mylist = [(row[0],0) for row in rows]
>
> I'll guess it's the list comprehension that confuses you.  That line is
> roughly equivalent to:
> mylist = []
> for row in rows:
>      mylist.append( (row[0], row) )

Except the second element in the tuple to append should be zero.

> So you end up with a list of tuples, each consisting of row[0] and

a zero

Presumably this will be the starting score for each item.


-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/