[Tutor] implied tuple in a list comprehension

[Alan Gauld]

On 02/08/13 19:13, Jim Mooney wrote:

> comma, then word in S, which made no sense, instead of unpacking -
> word for (idx, word) in S. Done in again by the implied tuple ;')

Just to pick up a point that might be confusing you.

A tuple does not need parentheses.

 >>> tup = 5,4
 >>> tup
(5, 4)
 >>> type(tup)
<type 'tuple'>

tup is a tuple. Its not implied it is complete. The parentheses
are only added to avoid ambiguity and aid readability.
For example a single item tuple is more obvious with
the parens:

t = (6,)  # t=6,  works but is much harder to see.

HTH,

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