I'm unfamiliar with the random.sample function, yet I can't help but wonder: Do you ever got the same card twice? Is that intentional ?
On Thu, Aug 28, 2008 at 6:29 PM, Alan Gilfoy <[EMAIL PROTECTED]> wrote: > Quoting W W <[EMAIL PROTECTED]>: > > >>> The number of items I want from a list is smaller than the population >>> (number of items) in the list, so it should work. >>> >>> In this specific case, I'm asking for one item from a five-item list. >> >> Are you sure? >> >> change this: >> for card in random.sample(SpecialA, SA): >> >> to this: >> >> print "Special: ", SpecialA, "\nSA: ", SA >> for card in random.sample(SpecialA, SA): >> >> then give us the output. I'll bet that your SA value is never reset to 1. >> > There is a part of my front-end code that declares the SA variable as equal > to 1 for the card set in question, and feeds that into the processing > function. > Changing the block of code, as you suggest, still gets me a traceback: > > Special: [] > SA: 1 > > Traceback (most recent call last): > File "C:\Documents and Settings\Alan\My > Documents\_Alan_Programming\trunk\BoosterPackMaker\BoosterPackMaker.py", > line 104, in <module> > SixList_PackChooser(C_list, UC_list, R_list, BL_list, SpecialA_list, > SpecialB_list, C, UC, R, BL, SA, SB) > File "C:\Documents and Settings\Alan\My > Documents\_Alan_Programming\trunk\BoosterPackMaker\PackGenerator.py", line > 367, in SixList_PackChooser > for card in random.sample(SpecialA, SA): > File "C:\Python25\lib\random.py", line 303, in sample > raise ValueError, "sample larger than population" > ValueError: sample larger than population > > So, I'm asking my program to pick 1 item from a 0-item list. How there are > zero items in the list, I don't know. That must be the problem. > >> >> You've obviously researched enough to know this: >>>>> >>>>> mylist = [1, 2, 3, 4, 5] >>>>> from random import sample >>>>> sample(mylist, 3) >> >> [2, 1, 4] >>>>> >>>>> sample(mylist, 10) >> >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> File "/usr/lib/python2.5/random.py", line 303, in sample >> raise ValueError, "sample larger than population" >> ValueError: sample larger than population >> > Okay, asking for 3 items from a 5-item list works, and asking for 10 items > from a 5-item list doesn't work. It should be trying to pick 1 item from the > 5-item SpecialA list, but somehow the SpecialA list has zero items in it. >> >> So give the print statement before your for loop a try and see what you >> come >> up with. > > Okay, I cut'n'pasted it before the traceback message. >> >> HTH, >> Wayne > > Thank you. > ----------------------------------------------- > SixList_PackChooser(C_list, UC_list, R_list, BL_list, SpecialA_list, > SpecialB_list, C, UC, R, BL, SA, SB) > > ^ The error occurs in this function. > The program picks C number of items from C_list and displays them just fine. > The program picks UC number of items from UC_list and displays them just > fine. > The program picks R number of items from R_list and displays them just fine. > The program picks BL number of items from BL_list and displays them just > fine. > > Looking at my user-interface/front-end, it looks like the function's being > fed proper values. > > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
