🌐 Mailman 3 March 2004 - Tutor - python.org

randomly gen values from .000001 to 10
by kevin parks May 6, 2004

May 6, 2004

Hi. I need to generate random values from 0.000001 to 10.00 i know that i can scale values with something like random.random()*.01 to get smaller values or random.random()*10 to get larger, but i am not sure how to get good random values over the whole range. I'd also love to be able to able to generate 0.000001 to 10.00 that were not an even distribution but tended towards certain values, but that maybe a problem for a different day... for now i would be happy with just getting 0.000001 to 10.00 cheers, kevin U-Va

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recursion and power sets
by alice April 27, 2004

April 27, 2004

Ouch! I think I've injured my brain on this one. I'm beginning to think recursion is not so cool after all..... I was trying to write a function that would take a set - represented as a list with non repeating elements - and return the power set, so given: [1,2,3] it should return: [[],[1],[2],[3],[1,2],[1,3],[2,3],[1,2,3]] After much general confusion, this is what I eventually came up with: def foo(pool,head,result,n): """ pool, head and result should be lists, n a positive integer """ if (n == 0): while (pool != []): head.append(pool.pop()) result.append(head[:]) head.pop() else: while (pool != []): head.append(pool.pop()) foo(pool[:],head,result,n-1) head.pop() def power(set): head = [] result = [[]] for i in range(len(set)): foo(set[:],head,result,i) return result This gives the subsets in a simmilar order to the one in which I would find them if I was doing it by hand, but its kind of difficult to think about, so I thought about it a bit more and came up with: def power(set): result = [] bits = len(set) for string in range(2**bits): subset = [] position = 0 while (string > 0): if (string % 2 != 0): subset.append(set[position]) string /= 2 position += 1 result.append(subset) return result Even though this algorithm gives the subsets in a completely different order to the way I'd normally find them by hand, I'm guessing its closer to the "canonical" algorithm for finding power sets than my recursive attempt, am I right? or is there a third, completely different way of doing this?

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checking variable types
by Marie Robichon April 2, 2004

April 2, 2004

Hi, I have a mutliple select box in html which (unfortunately) returns a list if someone makes a multiple selection but returns a string if someone selects one item only. How in my python script do I test whether it is a list or a string before I do my processing ? Thanks in advance from a newbie, Marie

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Off Topic: Revision control system
by Nick Lunt April 2, 2004

April 2, 2004

Hi Folks, I hope you don't mind me sending this but I thought I'd ask for your advice :) I run linux and have a bucket load of python scripts that I regularly amend and it's starting to get annoying, ie vi testfile.py ./testfile.py cp testfile.py testfile2.py vi testfile2.py ./testfile2.py cp testfile2.py testfile3.py vi testfile3.py etc I keep copying so I don't destroy something that works. Now my question is, do you folks use any sort of revision control system on linux ? I've had a look at CVS and RCS but both seem a bit over the top for my needs. Can anyone recommend a simpler solution please ? Or should I write my own (ha I wish). Many thanks Nick. ps if this does annoy anyone then I apologise.

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first steps
by peter hodgson April 2, 2004

April 2, 2004

hello; i've done my first forty or so tutorial programs; please take a look at and tell me if i'm on track; A. I DON'T UNDERSTAND THIS: Here is another example of variable usage: a = 1 print a a = a + 1 print a a = a * 2 print a And of course here is the output: 1 2 4 Even if it is the same variable on both sides [OF THE '='] the computer still reads it as: First find out the data to store [RIGHT SIDE OF THE '='?] and than [THEN] find out where the data goes [PRINT COMMAND?]. ---------------------- B. WHY WON'T THIS RUN? ----------------------- #while 1 == 1: would perpetuate the printing of "help..." #l3 - l6 [extracted from another program] should limit it to five times count = 0 max_count = 5 while count > max_count: count = count + 1 print "help, i'm caught in a loop" #but the program won't run ----------------------------- C.HAVE I PARSED THIS RIGHT? ----------------------------- #values into/out of a pail; #this is l1 a = 1 #this means a = non-zero, that it is; s = 0 #empty pail print "enter numbers to add to the sum" #plus or minus print "enter 0 to quit" #end the game while a != 0: #i.e., you're still playing the game; print "current sum:", s #so we start at 0 a = input("nmber? ") #and we alter s by a, superceding a = 1 s = s + a #and a is the increment #reducing s to 0 won't close program print "total sum = ", s #not indented cause it only runs at the end #l2, l3 provide the contents and the pail; #l5, l6 provide for a way to end the game; #playing the game is l4, plus the indented lines l7 - l9;

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embedding an if
by peter hodgson April 2, 2004

April 2, 2004

hello; 2.3 on a gentoo box; tutorial assignment; what am i doing wrong? thanks #Modify the password guessing program to keep track of how many times # the user has entered the password wrong. If it is more than 3 times, # print "you're screwed, buddy!", or something like that; passwd = "foobar" #a dummy passwd count = 3 current_count = 0 while passwd != "unicorn": current_count = current_count + 1 passwd = raw_input("Passwd: ") if current_count < count: print "no, stupid! try again;" else print "three times, you're out!" print "welcome in" #without 'count': keep asking for password until the jerk gets it right; #with 'count': he only gets three chances;

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Re: [Tutor] Python exes
by Magnus Lycka April 1, 2004

April 1, 2004

Brandon wrote: > I've tried all I can about creating a .exe file in python. I've googled, searched, and found everything I could, but I still can not get anything to work. Can someone point me in the right direction? You're not very explicit with what you tried, and what your problems were, but I've had memory errors with py2exe and McMillan installer that disappeared when I used cx_Freeze instead. See http://starship.python.net/crew/atuining/cx_Freeze/ -- Magnus Lycka, Thinkware AB Alvans vag 99, SE-907 50 UMEA, SWEDEN phone: int+46 70 582 80 65, fax: int+46 70 612 80 65 http://www.thinkware.se/ mailto:magnus@thinkware.se

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RE: [Tutor] Good threading tutorial
by Shawhan, Doug (EM, ITS) March 31, 2004

March 31, 2004

How about a nice "hello threads" example? :-) -----Original Message----- From: tutor-bounces(a)python.org [mailto:tutor-bounces@python.org]On Behalf Of R. Alan Monroe Sent: Wednesday, March 31, 2004 12:57 PM To: tutor(a)python.org Subject: Re: [Tutor] Good threading tutorial > I have googled up a few examples of threading in python. I am still > a little unclear on the concept. Are there any good hand-holding > threading tutorials around? >From what little I've played with it: - def a function that you want to get executed in a subthread - create a new thread, feed it the name of the function above - start the new thread at this point, you need not execute any further statements in your program. The main program will wait indefinitely for the child thread to complete. Once it's done, the main program will exit too. It's kind of neat to watch, the first time you try it. I haven't reached the level of locking or semaphores, myself. Alan _______________________________________________ Tutor maillist - Tutor(a)python.org http://mail.python.org/mailman/listinfo/tutor

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Good threading tutorial
by Shawhan, Doug (EM, ITS) March 31, 2004

March 31, 2004

I have googled up a few examples of threading in python. I am still a little unclear on the concept. Are there any good hand-holding threading tutorials around? Thanks! d

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RE: [Tutor] Python and Active directory
by Christian Wyglendowski March 31, 2004

March 31, 2004

Here is something to start with (code courtesy of http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=2f3c ef424c.tim%40worthy.demon.co.uk&rnum=2&prev=/groups%3Fq%3Dwin32com.clien t.getobject%2520ldap%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3D N%26tab%3Dwg ): #begin code import win32com.client #from Mark Hammond's pywin32 module def do_onecontainer(Container): for oneobject in Container: if oneobject.Class.lower()=='user': #found a user! do what you want here (print, write to file, add to database, etc) print oneobject.cn if oneobject.Class.lower()=="organizationalunit" or \ oneobject.Class.lower()== "container": #found a subcontainer - search it for users by recursively calling do_onecontainer() do_onecontainer(oneobject) startContainer=win32com.client.GetObject("LDAP://DC=yourdomain,DC=suffix ") #make sure to set your domain info do_onecontainer(startContainer) #end code There is probably a way to do this with ADODB and LDAP queries, but this works. Christian http://www.dowski.com -----Original Message----- From: Wilhelmsen Jan [mailto:Jan.Wilhelmsen@bilia.no] Sent: Tuesday, March 30, 2004 5:06 AM To: tutor(a)python.org Subject: [Tutor] Python and Active directory Hi! Is there any module or other ways of extracting/listing/modifying users/person account information from Active directory? If there is? Where can I find information about this? I need to make a script that exports all users in all OU's to a formatted textfile. Thanks! Jan Wilhelmsen

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