[Python-Dev] Re: questionnaire about zip and for loops

[Huaiyu Zhu]

You need to add a Reply-To: line so people wouldn't send to the list by
mistake.  It is also difficult for many editors and mailers to deal with
long lines.

Huaiyu

In comp.lang.python, you wrote:
>This is a slightly reduced version of a questionnaire run by Greg Wilson on some CS
>grad students.
>
>I'd like to use the readers of comp.lang.python as guinea pigs this time.
>
>PLEASE SEND THE RESULTS TO mailto:peter@schneider-kamp.de - DON'T SEND THEM TO THE LIST
>
>Thanks for your time,
>Peter
>
>-----------------------------------------------------------------------------------------
>
>The single and double loop below print the output shown:
>
>for x in [10, 20, 30]:           for x in [10, 20, 30]:
>    print x                          for y in [1, 2, 3]:
>                                         print x+y
>10                              11
>20                              12
>30                              13
>                                21
>                                22
>                                23
>                                31
>                                32
>                                33
>
>Match each of the following example for-loops to an output. Only make one cross per line.
>Please consider each example on its own.
>(Note that several examples may print the same thing.)
>
>
>                                                (1)     (2)     (3)     (4)     (5)     (6)
>
>                                                11      11      11      11      error   ??
>                                                22      12      22      12
>                                                33      13              21
>                                                        21              22
>                                                        22              31
>                                                        23              32
>                                                        31
>                                                        32
>                                                        33
>
>(A)
>for (x, y) in [[10, 1], [20, 2], [30, 3]]:      x       o       o       o       o       o
>    print x+y
>
>(B)
>for [x, y] in zip([10, 20, 30], [1, 2, 3]):     x       o       o       o       o       o
>    print x+y
>
>(C)
>for [x, y] in zip([10, 20, 30], [1, 2]):        o       o       x       o       o       o
>    print x+y
>
>(D)
>for x; y in [10, 20, 30]; [1, 2, 3]:            o       o       o       o       x       o
>    print x+y
>
>(E)
>for x; y in [10, 20, 30]; [1, 2]:               o       o       o       o       x       o
>    print x+y
>
>(F)
>for x in [10, 20, 30]; y in [1, 2, 3]:          o       x       o       o       o       o
>    print x+y
>
>(G)
>for x in [10, 20, 30]; y in [1, 2]:             o       o       o       x       o       o
>    print x+y
>
>
>--
>Peter Schneider-Kamp          ++47-7388-7331
>Herman Krags veg 51-11        mailto:peter@schneider-kamp.de
>N-7050 Trondheim              http://schneider-kamp.de
>