I'm giving a talk at the U. of Toronto tomorrow, and would like to re-run
the "what does it do?" experiment with list comprehensions and
simultaneous loops. I propose asking the following:
The program:
for x in [10, 20, 30]:
print x
prints:
10
20
30
and the program:
for x in [10, 20, 30]:
for y in [1, 2, 3]:
print x+y
prints:
11
12
13
21
22
23
31
32
33
Match each of the following:
(A) for x in [10, 20, 30]; y in [1, 2, 3]:
print x+y
(B) for (x,y) in zip([10, 20, 30], [1, 2, 3]):
print x+y
(C) for (x in [10, 20, 30]) and (y in [1, 2, 3]):
print x+y
(D) something else
to their output:
(1) 11
22
33
(2) 11
12
13
21
22
23
31
32
33
(3) "Run-Time Error"
Questions:
1. What should option (D) be?
2. Should the lists be the same length, or different lengths? I think the
latter is the trickier case (equally reasonable to say "iterate for
length of shortest" and "error if lists' lengths unequal") --- is that
worth testing?
3. Can someone provide a couple of list comprehension alternatives as
well?
Reactions?
Greg
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