[Python-Dev] re: list comprehension / pop quiz

[Guido van Rossum]

> Yes, I'll have a roomful of people Thursday morning (practicing my talk
> for Monterey).  If someone would like to rephrase the example, I'd be
> happy to do a show-of-hands poll.

Suppose this code:

    for i in (1, 2, 3):
	print i

prints this:

    1
    2
    3

What do you think the following code would print?

    for i in (10, 20, 30); j in (1, 2, 3):
        print i+j

A.

    11
    22
    33

B.
    11
    12
    13
    21
    22
    23
    31
    32
    33

I'm afraid the answer will be the same, if these are again numerical
analysts -- these people live by nested DO loops. :-(

--Guido van Rossum (home page: http://dinsdale.python.org/~guido/)